diff --git a/amalloc.c b/amalloc.c
index 9592988..db38c85 100644
--- a/amalloc.c
+++ b/amalloc.c
@@ -7,6 +7,8 @@
 #include <stdlib.h>
 #include "config.h"
 
+extern void* memset(void*,int,size_t);
+
 #define MAGIC 0x1f2e3d4c
 
 struct alist { int magic, size, index; int *end; struct alist *next, *last; };