diff --git a/src/flathash.cpp b/src/flathash.cpp
index bbd865e2a..3b7db6607 100644
--- a/src/flathash.cpp
+++ b/src/flathash.cpp
@@ -18,6 +18,7 @@
 #include <sstream>
 #include <string>
 #include "flatbuffers/hash.h"
+#include <stdio.h>
 
 enum OutputFormat {
   kDecimal,