diff --git a/src/Duration.cpp b/src/Duration.cpp
index baa73f334..583ad2b37 100644
--- a/src/Duration.cpp
+++ b/src/Duration.cpp
@@ -29,6 +29,8 @@
 #include <string>
 #include <vector>
 #include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
 #include "text.h"
 #include "util.h"
 #include "Duration.h"