diff --git a/Grid/GridStd.h b/Grid/GridStd.h
index 28f6bc46..d0a8124a 100644
--- a/Grid/GridStd.h
+++ b/Grid/GridStd.h
@@ -16,6 +16,7 @@
 #include <functional>
 #include <stdio.h>
 #include <stdlib.h>
+#include <strings.h>
 #include <stdio.h>
 #include <signal.h>
 #include <ctime>