diff --git a/src/vm.c b/src/vm.c
index b0917b4..2fa7d11 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -1,5 +1,6 @@
 #include "vm.h"
 #include "debug.h"
+#include <string.h>
 
 #define COMPARE_AND_JUMP(type, accessor, op)                                   \
   do {                                                                         \