diff --git a/common/string_util.h b/common/string_util.h
index 31ba4c587..70e888bdf 100644
--- a/common/string_util.h
+++ b/common/string_util.h
@@ -17,8 +17,10 @@
 #define _STRINGUTIL_H_
 
 #include <sstream>
+#include <string.h>
 #include <vector>
 #include <cstdarg>
+
 #include "types.h"