diff --git a/runtime/include/wasm_stack.h b/runtime/include/wasm_stack.h
index ce07100..2ad0e08 100644
--- a/runtime/include/wasm_stack.h
+++ b/runtime/include/wasm_stack.h
@@ -3,6 +3,7 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <sys/mman.h>
+#include <string.h>
 
 #include "sandbox_types.h"
 #include "types.h"