diff --git a/libmosquitto/time_mosq.c b/libmosquitto/time_mosq.c
index ac8e033..e02788f 100644
--- a/libmosquitto/time_mosq.c
+++ b/libmosquitto/time_mosq.c
@@ -85,7 +85,7 @@ time_t mosquitto_time(void)
 	if(tb.denom == 0){
 		mach_timebase_info(&tb);
 	}
-	sec = (ticks/1000000000)*(tb.numer/tb.denom);
+	sec = ((double)ticks/1000000000)*((double)tb.numer/tb.denom);
 
 	return (time_t)sec;
 #else