diff --git a/Core/timing.c b/Core/timing.c
index 1633dc8..965ba27 100644
--- a/Core/timing.c
+++ b/Core/timing.c
@@ -296,7 +296,7 @@ void GB_rtc_run(GB_gameboy_t *gb)
         time_t current_time = time(NULL);
         
         while (gb->last_rtc_second + 60 * 60 * 24 < current_time) {
-            gb->last_rtc_second += 60 * 60 + 24;
+            gb->last_rtc_second += 60 * 60 * 24;
             if (++gb->rtc_real.days == 0) {
                 if (gb->rtc_real.high & 1) { /* Bit 8 of days*/
                     gb->rtc_real.high |= 0x80; /* Overflow bit */