diff --git a/libc/time/tzfile.internal.h b/libc/time/tzfile.internal.h
index bfef13de0..2ec866ead 100644
--- a/libc/time/tzfile.internal.h
+++ b/libc/time/tzfile.internal.h
@@ -25,7 +25,7 @@
 #endif /* !defined TZDIR */
 
 #ifndef TZDEFAULT
-#define TZDEFAULT	"GST"
+#define TZDEFAULT	"GMT"
 #endif /* !defined TZDEFAULT */
 
 #ifndef TZDEFRULES