diff --git a/include/globals.h b/include/globals.h
index 78e633b5..dc7316b9 100644
--- a/include/globals.h
+++ b/include/globals.h
@@ -6,6 +6,7 @@
 
 // Time functions
 #ifdef HAS_RTC
+#include <RtcUtility.h>
 #include <RtcDateTime.h>
 #endif
 #include <Ticker.h>