diff --git a/uisimulator/x11/timefuncs.h b/uisimulator/x11/timefuncs.h
index c2dcf3c888..c1b6ef8196 100644
--- a/uisimulator/x11/timefuncs.h
+++ b/uisimulator/x11/timefuncs.h
@@ -1,2 +1,4 @@
+#include <time.h>
 
 /* struct tm defined */
+struct tm *get_time(void);