diff --git a/crypto/asn1/a_set.c b/crypto/asn1/a_set.c
index 2675476f18..d726c8d3a8 100644
--- a/crypto/asn1/a_set.c
+++ b/crypto/asn1/a_set.c
@@ -85,7 +85,7 @@ static int SetBlobCmp(const void *elem1, const void *elem2 )
     }
 
 /* int is_set:  if TRUE, then sort the contents (i.e. it isn't a SEQUENCE)    */
-int i2d_ASN1_SET(STACK_OF(BLOCK) *a, unsigned char **pp,
+int i2d_ASN1_SET(STACK_OF(OPENSSL_BLOCK) *a, unsigned char **pp,
 		 i2d_of_void *i2d, int ex_tag, int ex_class,
 		 int is_set)
 	{
@@ -97,8 +97,8 @@ int i2d_ASN1_SET(STACK_OF(BLOCK) *a, unsigned char **pp,
         int totSize;
 
 	if (a == NULL) return(0);
-	for (i=sk_BLOCK_num(a)-1; i>=0; i--)
-		ret+=i2d(sk_BLOCK_value(a,i),NULL);
+	for (i=sk_OPENSSL_BLOCK_num(a)-1; i>=0; i--)
+		ret+=i2d(sk_OPENSSL_BLOCK_value(a,i),NULL);
 	r=ASN1_object_size(1,ret,ex_tag);
 	if (pp == NULL) return(r);
 
@@ -109,10 +109,10 @@ int i2d_ASN1_SET(STACK_OF(BLOCK) *a, unsigned char **pp,
 	/* And then again by Ben */
 	/* And again by Steve */
 
-	if(!is_set || (sk_BLOCK_num(a) < 2))
+	if(!is_set || (sk_OPENSSL_BLOCK_num(a) < 2))
 		{
-		for (i=0; i<sk_BLOCK_num(a); i++)
-                	i2d(sk_BLOCK_value(a,i),&p);
+		for (i=0; i<sk_OPENSSL_BLOCK_num(a); i++)
+                	i2d(sk_OPENSSL_BLOCK_value(a,i),&p);
 
 		*pp=p;
 		return(r);
@@ -120,17 +120,17 @@ int i2d_ASN1_SET(STACK_OF(BLOCK) *a, unsigned char **pp,
 
         pStart  = p; /* Catch the beg of Setblobs*/
 		/* In this array we will store the SET blobs */
-		rgSetBlob = OPENSSL_malloc(sk_BLOCK_num(a) * sizeof(MYBLOB));
+		rgSetBlob = OPENSSL_malloc(sk_OPENSSL_BLOCK_num(a) * sizeof(MYBLOB));
 		if (rgSetBlob == NULL)
 			{
 			ASN1err(ASN1_F_I2D_ASN1_SET,ERR_R_MALLOC_FAILURE);
 			return(0);
 			}
 
-        for (i=0; i<sk_BLOCK_num(a); i++)
+        for (i=0; i<sk_OPENSSL_BLOCK_num(a); i++)
 	        {
                 rgSetBlob[i].pbData = p;  /* catch each set encode blob */
-                i2d(sk_BLOCK_value(a,i),&p);
+                i2d(sk_OPENSSL_BLOCK_value(a,i),&p);
                 rgSetBlob[i].cbData = p - rgSetBlob[i].pbData; /* Length of this
 SetBlob
 */
@@ -140,7 +140,7 @@ SetBlob
 
  /* Now we have to sort the blobs. I am using a simple algo.
     *Sort ptrs *Copy to temp-mem *Copy from temp-mem to user-mem*/
-        qsort( rgSetBlob, sk_BLOCK_num(a), sizeof(MYBLOB), SetBlobCmp);
+        qsort( rgSetBlob, sk_OPENSSL_BLOCK_num(a), sizeof(MYBLOB), SetBlobCmp);
 		if (!(pTempMem = OPENSSL_malloc(totSize)))
 			{
 			ASN1err(ASN1_F_I2D_ASN1_SET,ERR_R_MALLOC_FAILURE);
@@ -149,7 +149,7 @@ SetBlob
 
 /* Copy to temp mem */
         p = pTempMem;
-        for(i=0; i<sk_BLOCK_num(a); ++i)
+        for(i=0; i<sk_OPENSSL_BLOCK_num(a); ++i)
 		{
                 memcpy(p, rgSetBlob[i].pbData, rgSetBlob[i].cbData);
                 p += rgSetBlob[i].cbData;
@@ -163,17 +163,18 @@ SetBlob
         return(r);
         }
 
-STACK_OF(BLOCK) *d2i_ASN1_SET(STACK_OF(BLOCK) **a, const unsigned char **pp,
+STACK_OF(OPENSSL_BLOCK) *d2i_ASN1_SET(STACK_OF(OPENSSL_BLOCK) **a,
+			      const unsigned char **pp,
 			      long length, d2i_of_void *d2i,
-			      void (*free_func)(BLOCK), int ex_tag,
+			      void (*free_func)(OPENSSL_BLOCK), int ex_tag,
 			      int ex_class)
 	{
 	ASN1_const_CTX c;
-	STACK_OF(BLOCK) *ret=NULL;
+	STACK_OF(OPENSSL_BLOCK) *ret=NULL;
 
 	if ((a == NULL) || ((*a) == NULL))
 		{
-		if ((ret=sk_BLOCK_new_null()) == NULL)
+		if ((ret=sk_OPENSSL_BLOCK_new_null()) == NULL)
 			{
 			ASN1err(ASN1_F_D2I_ASN1_SET,ERR_R_MALLOC_FAILURE);
 			goto err;
@@ -221,7 +222,7 @@ STACK_OF(BLOCK) *d2i_ASN1_SET(STACK_OF(BLOCK) **a, const unsigned char **pp,
 			asn1_add_error(*pp,(int)(c.p- *pp));
 			goto err;
 			}
-		if (!sk_BLOCK_push(ret,s)) goto err;
+		if (!sk_OPENSSL_BLOCK_push(ret,s)) goto err;
 		}
 	if (a != NULL) (*a)=ret;
 	*pp=c.p;
@@ -230,9 +231,9 @@ err:
 	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
 		{
 		if (free_func != NULL)
-			sk_BLOCK_pop_free(ret,free_func);
+			sk_OPENSSL_BLOCK_pop_free(ret,free_func);
 		else
-			sk_BLOCK_free(ret);
+			sk_OPENSSL_BLOCK_free(ret);
 		}
 	return(NULL);
 	}
diff --git a/crypto/asn1/asn1.h b/crypto/asn1/asn1.h
index d85b3dd4a3..c1af4e7943 100644
--- a/crypto/asn1/asn1.h
+++ b/crypto/asn1/asn1.h
@@ -887,12 +887,13 @@ int ASN1_TIME_check(ASN1_TIME *t);
 ASN1_GENERALIZEDTIME *ASN1_TIME_to_generalizedtime(ASN1_TIME *t, ASN1_GENERALIZEDTIME **out);
 int ASN1_TIME_set_string(ASN1_TIME *s, const char *str);
 
-int i2d_ASN1_SET(STACK_OF(BLOCK) *a, unsigned char **pp,
+int i2d_ASN1_SET(STACK_OF(OPENSSL_BLOCK) *a, unsigned char **pp,
 		 i2d_of_void *i2d, int ex_tag, int ex_class,
 		 int is_set);
-STACK_OF(BLOCK) *d2i_ASN1_SET(STACK_OF(BLOCK) **a, const unsigned char **pp,
+STACK_OF(OPENSSL_BLOCK) *d2i_ASN1_SET(STACK_OF(OPENSSL_BLOCK) **a,
+			      const unsigned char **pp,
 			      long length, d2i_of_void *d2i,
-			      void (*free_func)(BLOCK), int ex_tag,
+			      void (*free_func)(OPENSSL_BLOCK), int ex_tag,
 			      int ex_class);
 
 #ifndef OPENSSL_NO_BIO
@@ -1045,9 +1046,9 @@ int ASN1_TYPE_set_int_octetstring(ASN1_TYPE *a, long num,
 int ASN1_TYPE_get_int_octetstring(ASN1_TYPE *a,long *num,
 	unsigned char *data, int max_len);
 
-STACK_OF(BLOCK) *ASN1_seq_unpack(const unsigned char *buf, int len,
-				 d2i_of_void *d2i, void (*free_func)(BLOCK));
-unsigned char *ASN1_seq_pack(STACK_OF(BLOCK) *safes, i2d_of_void *i2d,
+STACK_OF(OPENSSL_BLOCK) *ASN1_seq_unpack(const unsigned char *buf, int len,
+				 d2i_of_void *d2i, void (*free_func)(OPENSSL_BLOCK));
+unsigned char *ASN1_seq_pack(STACK_OF(OPENSSL_BLOCK) *safes, i2d_of_void *i2d,
 			     unsigned char **buf, int *len );
 void *ASN1_unpack_string(ASN1_STRING *oct, d2i_of_void *d2i);
 void *ASN1_item_unpack(ASN1_STRING *oct, const ASN1_ITEM *it);
diff --git a/crypto/asn1/asn_pack.c b/crypto/asn1/asn_pack.c
index a57511e207..ad738217d7 100644
--- a/crypto/asn1/asn_pack.c
+++ b/crypto/asn1/asn_pack.c
@@ -66,10 +66,10 @@
 
 /* Turn an ASN1 encoded SEQUENCE OF into a STACK of structures */
 
-STACK_OF(BLOCK) *ASN1_seq_unpack(const unsigned char *buf, int len,
-				 d2i_of_void *d2i, void (*free_func)(BLOCK))
+STACK_OF(OPENSSL_BLOCK) *ASN1_seq_unpack(const unsigned char *buf, int len,
+			 d2i_of_void *d2i, void (*free_func)(OPENSSL_BLOCK))
 {
-    STACK_OF(BLOCK) *sk;
+    STACK_OF(OPENSSL_BLOCK) *sk;
     const unsigned char *pbuf;
     pbuf =  buf;
     if (!(sk = d2i_ASN1_SET(NULL, &pbuf, len, d2i, free_func,
@@ -82,7 +82,7 @@ STACK_OF(BLOCK) *ASN1_seq_unpack(const unsigned char *buf, int len,
  * OPENSSL_malloc'ed buffer
  */
 
-unsigned char *ASN1_seq_pack(STACK_OF(BLOCK) *safes, i2d_of_void *i2d,
+unsigned char *ASN1_seq_pack(STACK_OF(OPENSSL_BLOCK) *safes, i2d_of_void *i2d,
 			     unsigned char **buf, int *len)
 {
 	int safelen;
diff --git a/crypto/stack/safestack.h b/crypto/stack/safestack.h
index 18fbd38da7..0583d27002 100644
--- a/crypto/stack/safestack.h
+++ b/crypto/stack/safestack.h
@@ -128,8 +128,8 @@ DECLARE_SPECIAL_STACK_OF(OPENSSL_STRING, char)
  * nul-terminated. These should also be distinguished from "normal"
  * stacks. */
 
-typedef void *BLOCK;
-DECLARE_SPECIAL_STACK_OF(BLOCK, void)
+typedef void *OPENSSL_BLOCK;
+DECLARE_SPECIAL_STACK_OF(OPENSSL_BLOCK, void)
 
 /* SKM_sk_... stack macros are internal to safestack.h:
  * never use them directly, use sk_<type>_... instead */
@@ -2055,29 +2055,29 @@ DECLARE_SPECIAL_STACK_OF(BLOCK, void)
 #define sk_OPENSSL_STRING_is_sorted(st) SKM_sk_is_sorted(OPENSSL_STRING, (st))
 
 
-#define sk_BLOCK_new(cmp) ((STACK_OF(BLOCK) *)sk_new(CHECKED_SK_CMP_FUNC(void, cmp)))
-#define sk_BLOCK_new_null() ((STACK_OF(BLOCK) *)sk_new_null())
-#define sk_BLOCK_push(st, val) sk_push(CHECKED_PTR_OF(STACK_OF(BLOCK), st), CHECKED_PTR_OF(void, val))
-#define sk_BLOCK_find(st, val) sk_find(CHECKED_PTR_OF(STACK_OF(BLOCK), st), CHECKED_PTR_OF(void, val))
-#define sk_BLOCK_value(st, i) ((BLOCK)sk_value(CHECKED_PTR_OF(STACK_OF(BLOCK), st), i))
-#define sk_BLOCK_num(st) SKM_sk_num(BLOCK, st)
-#define sk_BLOCK_pop_free(st, free_func) sk_pop_free(CHECKED_PTR_OF(STACK_OF(BLOCK), st), CHECKED_SK_FREE_FUNC2(BLOCK, free_func))
-#define sk_BLOCK_insert(st, val, i) sk_insert(CHECKED_PTR_OF(STACK_OF(BLOCK), st), CHECKED_PTR_OF(void, val), i)
-#define sk_BLOCK_free(st) SKM_sk_free(BLOCK, st)
-#define sk_BLOCK_set(st, i, val) sk_set((_STACK *)CHECKED_PTR_OF(STACK_OF(BLOCK), st), i, CHECKED_PTR_OF(void, val))
-#define sk_BLOCK_zero(st) SKM_sk_zero(BLOCK, (st))
-#define sk_BLOCK_unshift(st, val) sk_unshift((_STACK *)CHECKED_PTR_OF(STACK_OF(BLOCK), st), CHECKED_PTR_OF(void, val))
-#define sk_BLOCK_find_ex(st, val) sk_find_ex((_STACK *)CHECKED_CONST_PTR_OF(STACK_OF(BLOCK), st), CHECKED_CONST_PTR_OF(void, val))
-#define sk_BLOCK_delete(st, i) SKM_sk_delete(BLOCK, (st), (i))
-#define sk_BLOCK_delete_ptr(st, ptr) (BLOCK *)sk_delete_ptr((_STACK *)CHECKED_PTR_OF(STACK_OF(BLOCK), st), CHECKED_PTR_OF(void, ptr))
-#define sk_BLOCK_set_cmp_func(st, cmp)  \
+#define sk_OPENSSL_BLOCK_new(cmp) ((STACK_OF(OPENSSL_BLOCK) *)sk_new(CHECKED_SK_CMP_FUNC(void, cmp)))
+#define sk_OPENSSL_BLOCK_new_null() ((STACK_OF(OPENSSL_BLOCK) *)sk_new_null())
+#define sk_OPENSSL_BLOCK_push(st, val) sk_push(CHECKED_PTR_OF(STACK_OF(OPENSSL_BLOCK), st), CHECKED_PTR_OF(void, val))
+#define sk_OPENSSL_BLOCK_find(st, val) sk_find(CHECKED_PTR_OF(STACK_OF(OPENSSL_BLOCK), st), CHECKED_PTR_OF(void, val))
+#define sk_OPENSSL_BLOCK_value(st, i) ((OPENSSL_BLOCK)sk_value(CHECKED_PTR_OF(STACK_OF(OPENSSL_BLOCK), st), i))
+#define sk_OPENSSL_BLOCK_num(st) SKM_sk_num(OPENSSL_BLOCK, st)
+#define sk_OPENSSL_BLOCK_pop_free(st, free_func) sk_pop_free(CHECKED_PTR_OF(STACK_OF(OPENSSL_BLOCK), st), CHECKED_SK_FREE_FUNC2(OPENSSL_BLOCK, free_func))
+#define sk_OPENSSL_BLOCK_insert(st, val, i) sk_insert(CHECKED_PTR_OF(STACK_OF(OPENSSL_BLOCK), st), CHECKED_PTR_OF(void, val), i)
+#define sk_OPENSSL_BLOCK_free(st) SKM_sk_free(OPENSSL_BLOCK, st)
+#define sk_OPENSSL_BLOCK_set(st, i, val) sk_set((_STACK *)CHECKED_PTR_OF(STACK_OF(OPENSSL_BLOCK), st), i, CHECKED_PTR_OF(void, val))
+#define sk_OPENSSL_BLOCK_zero(st) SKM_sk_zero(OPENSSL_BLOCK, (st))
+#define sk_OPENSSL_BLOCK_unshift(st, val) sk_unshift((_STACK *)CHECKED_PTR_OF(STACK_OF(OPENSSL_BLOCK), st), CHECKED_PTR_OF(void, val))
+#define sk_OPENSSL_BLOCK_find_ex(st, val) sk_find_ex((_STACK *)CHECKED_CONST_PTR_OF(STACK_OF(OPENSSL_BLOCK), st), CHECKED_CONST_PTR_OF(void, val))
+#define sk_OPENSSL_BLOCK_delete(st, i) SKM_sk_delete(OPENSSL_BLOCK, (st), (i))
+#define sk_OPENSSL_BLOCK_delete_ptr(st, ptr) (OPENSSL_BLOCK *)sk_delete_ptr((_STACK *)CHECKED_PTR_OF(STACK_OF(OPENSSL_BLOCK), st), CHECKED_PTR_OF(void, ptr))
+#define sk_OPENSSL_BLOCK_set_cmp_func(st, cmp)  \
 	((int (*)(const void * const *,const void * const *)) \
-	sk_set_cmp_func((_STACK *)CHECKED_PTR_OF(STACK_OF(BLOCK), st), CHECKED_SK_CMP_FUNC(void, cmp)))
-#define sk_BLOCK_dup(st) SKM_sk_dup(BLOCK, st)
-#define sk_BLOCK_shift(st) SKM_sk_shift(BLOCK, (st))
-#define sk_BLOCK_pop(st) (void *)sk_pop((_STACK *)CHECKED_PTR_OF(STACK_OF(BLOCK), st))
-#define sk_BLOCK_sort(st) SKM_sk_sort(BLOCK, (st))
-#define sk_BLOCK_is_sorted(st) SKM_sk_is_sorted(BLOCK, (st))
+	sk_set_cmp_func((_STACK *)CHECKED_PTR_OF(STACK_OF(OPENSSL_BLOCK), st), CHECKED_SK_CMP_FUNC(void, cmp)))
+#define sk_OPENSSL_BLOCK_dup(st) SKM_sk_dup(OPENSSL_BLOCK, st)
+#define sk_OPENSSL_BLOCK_shift(st) SKM_sk_shift(OPENSSL_BLOCK, (st))
+#define sk_OPENSSL_BLOCK_pop(st) (void *)sk_pop((_STACK *)CHECKED_PTR_OF(STACK_OF(OPENSSL_BLOCK), st))
+#define sk_OPENSSL_BLOCK_sort(st) SKM_sk_sort(OPENSSL_BLOCK, (st))
+#define sk_OPENSSL_BLOCK_is_sorted(st) SKM_sk_is_sorted(OPENSSL_BLOCK, (st))
 
 
 #define sk_OPENSSL_PSTRING_new(cmp) ((STACK_OF(OPENSSL_PSTRING) *)sk_new(CHECKED_SK_CMP_FUNC(OPENSSL_STRING, cmp)))