diff --git a/src/std/c_macro.h b/src/std/c_macro.h
index 7d5ba9959a..617b2c1c20 100644
--- a/src/std/c_macro.h
+++ b/src/std/c_macro.h
@@ -34,6 +34,7 @@
 #define _C_MACRO_H
 
 #include <stdlib.h>
+#include <string.h>
 
 #ifdef malloc
 #undef malloc