diff --git a/src/fsfw/timemanager/TimeReaderIF.h b/src/fsfw/timemanager/TimeReaderIF.h
index aa64b754..6735b10f 100644
--- a/src/fsfw/timemanager/TimeReaderIF.h
+++ b/src/fsfw/timemanager/TimeReaderIF.h
@@ -3,6 +3,7 @@
 
 #include <cstdio>
 #include <cstdlib>
+#include <ctime>
 
 #include "fsfw/platform.h"