diff --git a/SignalServiceKit/src/Util/NSDate+OWS.h b/SignalServiceKit/src/Util/NSDate+OWS.h
index 338e9d205..6d3336abc 100755
--- a/SignalServiceKit/src/Util/NSDate+OWS.h
+++ b/SignalServiceKit/src/Util/NSDate+OWS.h
@@ -17,7 +17,9 @@ extern const NSTimeInterval kMonthInterval;
 #define kDayInMs (kHourInMs * 24)
 #define kWeekInMs (kDayInMs * 7)
 #define kMonthInMs (kDayInMs * 30)
-#define kYearsInMs (kDayInMs * 365)
+
+// kYearsInMs is a double to avoid overflow
+#define kYearsInMs (kDayInMs * 365.0)
 
 @interface NSDate (OWS)