diff --git a/shared/libc/string0.c b/shared/libc/string0.c
index 0d22c2d99b..86e7cc5960 100644
--- a/shared/libc/string0.c
+++ b/shared/libc/string0.c
@@ -26,6 +26,7 @@
 
 #include <stdint.h>
 #include <stddef.h>
+#include <string.h>
 
 #ifndef likely
 #define likely(x) __builtin_expect((x), 1)
@@ -68,6 +69,7 @@ void *memcpy(void *dst, const void *src, size_t n) {
     return dst;
 }
 
+extern void *__memcpy_chk(void *dest, const void *src, size_t len, size_t slen);
 void *__memcpy_chk(void *dest, const void *src, size_t len, size_t slen) {
     if (len > slen) {
         return NULL;