diff --git a/src/fsfw/timemanager/TimeReaderIF.h b/src/fsfw/timemanager/TimeReaderIF.h
index 8fd7415f..be03fb2a 100644
--- a/src/fsfw/timemanager/TimeReaderIF.h
+++ b/src/fsfw/timemanager/TimeReaderIF.h
@@ -1,6 +1,7 @@
 #ifndef FSFW_TIMEMANAGER_TIMEREADERIF_H
 #define FSFW_TIMEMANAGER_TIMEREADERIF_H
 
+#include <cstdio>
 #include <cstdlib>
 
 #include "TimeStampIF.h"