--- a/lib/dgif_lib.c
+++ b/lib/dgif_lib.c
@@ -23,6 +23,8 @@
 #include "gif_lib.h"
 #include "gif_lib_private.h"
 
+extern void *reallocarray(void *optr, size_t nmemb, size_t size);
+
 /* compose unsigned little endian value */
 #define UNSIGNED_LITTLE_ENDIAN(lo, hi)	((lo) | ((hi) << 8))
 
--- a/lib/gif_lib.h
+++ b/lib/gif_lib.h
@@ -244,9 +244,6 @@
                                      GifPixelType ColorTransIn2[]);
 extern int GifBitSize(int n);
 
-extern void *
-reallocarray(void *optr, size_t nmemb, size_t size);
-
 /******************************************************************************
  Support for the in-core structures allocation (slurp mode).              
 ******************************************************************************/
--- a/lib/gifalloc.c
+++ b/lib/gifalloc.c
@@ -10,6 +10,8 @@
 
 #include "gif_lib.h"
 
+extern void *reallocarray(void *optr, size_t nmemb, size_t size);
+
 #define MAX(x, y)    (((x) > (y)) ? (x) : (y))
 
 /******************************************************************************