diff --git a/winpr/libwinpr/timezone/timezone.c b/winpr/libwinpr/timezone/timezone.c
index 12fcd444e..d8e33e019 100644
--- a/winpr/libwinpr/timezone/timezone.c
+++ b/winpr/libwinpr/timezone/timezone.c
@@ -341,7 +341,7 @@ DWORD GetTimeZoneInformation(LPTIME_ZONE_INFORMATION lpTimeZoneInformation)
 	time_t t;
 	struct tm tres;
 	struct tm* local_time;
-	TIME_ZONE_ENTRY* dtz;
+	TIME_ZONE_ENTRY* dtz = NULL;
 	LPTIME_ZONE_INFORMATION tz = lpTimeZoneInformation;
 	lpTimeZoneInformation->StandardBias = 0;
 	time(&t);