diff --git a/crypto/ec/ec_mult.c b/crypto/ec/ec_mult.c
index 84488c9643..f05df5332e 100644
--- a/crypto/ec/ec_mult.c
+++ b/crypto/ec/ec_mult.c
@@ -419,7 +419,7 @@ int ec_wNAF_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
 			if (numblocks > pre_comp->numblocks)
 				numblocks = pre_comp->numblocks;
 
-			pre_points_per_block = 1u << (pre_comp->w - 1);
+			pre_points_per_block = (size_t)1 << (pre_comp->w - 1);
 
 			/* check that pre_comp looks sane */
 			if (pre_comp->num != (pre_comp->numblocks * pre_points_per_block))
@@ -461,7 +461,7 @@ int ec_wNAF_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
 
 		bits = i < num ? BN_num_bits(scalars[i]) : BN_num_bits(scalar);
 		wsize[i] = EC_window_bits_for_scalar_size(bits);
-		num_val += 1u << (wsize[i] - 1);
+		num_val += (size_t)1 << (wsize[i] - 1);
 		wNAF[i + 1] = NULL; /* make sure we always have a pivot */
 		wNAF[i] = compute_wNAF((i < num ? scalars[i] : scalar), wsize[i], &wNAF_len[i]);
 		if (wNAF[i] == NULL)
@@ -600,7 +600,7 @@ int ec_wNAF_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
 	for (i = 0; i < num + num_scalar; i++)
 		{
 		val_sub[i] = v;
-		for (j = 0; j < (1u << (wsize[i] - 1)); j++)
+		for (j = 0; j < ((size_t)1 << (wsize[i] - 1)); j++)
 			{
 			*v = EC_POINT_new(group);
 			if (*v == NULL) goto err;
@@ -636,7 +636,7 @@ int ec_wNAF_mul(const EC_GROUP *group, EC_POINT *r, const BIGNUM *scalar,
 		if (wsize[i] > 1)
 			{
 			if (!EC_POINT_dbl(group, tmp, val_sub[i][0], ctx)) goto err;
-			for (j = 1; j < (1u << (wsize[i] - 1)); j++)
+			for (j = 1; j < ((size_t)1 << (wsize[i] - 1)); j++)
 				{
 				if (!EC_POINT_add(group, val_sub[i][j], val_sub[i][j - 1], tmp, ctx)) goto err;
 				}
@@ -820,7 +820,7 @@ int ec_wNAF_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
 
 	numblocks = (bits + blocksize - 1) / blocksize; /* max. number of blocks to use for wNAF splitting */
 	
-	pre_points_per_block = 1u << (w - 1);
+	pre_points_per_block = (size_t)1 << (w - 1);
 	num = pre_points_per_block * numblocks; /* number of points to compute and store */
 
 	points = OPENSSL_malloc(sizeof (EC_POINT*)*(num + 1));