diff --git a/tommath_private.h b/tommath_private.h
index 725aa4bca..48cf37d0f 100644
--- a/tommath_private.h
+++ b/tommath_private.h
@@ -41,12 +41,10 @@ extern "C" {
 #   define XMALLOC   malloc
 #   define XFREE     free
 #   define XREALLOC  realloc
-#   define XCALLOC   calloc
 #else
 /* prototypes for our heap functions */
 extern void *XMALLOC(size_t n);
 extern void *XREALLOC(void *p, size_t n);
-extern void *XCALLOC(size_t n, size_t s);
 extern void XFREE(void *p);
 #endif