diff --git a/pycardium/modules/utime.c b/pycardium/modules/utime.c
index 88fe86b9ad2933d1f5e109e0113cf24453be69d3..4b06a9cd5419ffb77f433d3a4fed2a3a464df63b 100644
--- a/pycardium/modules/utime.c
+++ b/pycardium/modules/utime.c
@@ -45,8 +45,8 @@ MP_DEFINE_CONST_FUN_OBJ_0(time_time_obj, time_time);
 static mp_obj_t time_time_ms(void)
 {
 	uint64_t milliseconds;
-	milliseconds = epic_rtc_get_milliseconds() -
-		       (EPOCH_OFFSET + TZONE_OFFSET) * 1000ULL;
+	milliseconds = epic_rtc_get_milliseconds() - EPOCH_OFFSET * 1000ULL +
+		       TZONE_OFFSET * 1000ULL;
 	return mp_obj_new_int_from_ull(milliseconds);
 }
 MP_DEFINE_CONST_FUN_OBJ_0(time_time_ms_obj, time_time_ms);