diff --git a/utils/crypt_tool/main.cpp b/utils/crypt_tool/main.cpp
index 3cdaf680..50749e57 100644
--- a/utils/crypt_tool/main.cpp
+++ b/utils/crypt_tool/main.cpp
@@ -1,5 +1,6 @@
 #include "pip.h"
 #include "picrypt.h"
+#include <stdio.h>
 
 using namespace PICoutManipulators;