diff --git a/desmume/src/rtc.cpp b/desmume/src/rtc.cpp
index 41c1d0746..a94d492af 100644
--- a/desmume/src/rtc.cpp
+++ b/desmume/src/rtc.cpp
@@ -79,7 +79,7 @@ struct movietime {
 struct movietime movie;
 
 int oldframeCounter;
-u64 totalcycles=2904024960000;//noon
+u64 totalcycles=2904024960000ULL;//noon
 int totalseconds;
 bool init=false;
 bool moviemode=false;
@@ -369,4 +369,4 @@ void rtcWrite(u16 val)
 	rtc._prevSIO = rtc._SIO;
 	rtc._prevSCK = rtc._SCK;
 	rtc._prevCS  = rtc._CS;
-}
\ No newline at end of file
+}