diff --git a/compat/mingw.c b/compat/mingw.c
index 1be75088a1..5ff39578b2 100644
--- a/compat/mingw.c
+++ b/compat/mingw.c
@@ -2236,8 +2236,14 @@ void mingw_startup()
 	__argv[0] = wcstoutfdup_startup(buffer, _wpgmptr, maxlen);
 	for (i = 1; i < argc; i++)
 		__argv[i] = wcstoutfdup_startup(buffer, wargv[i], maxlen);
-	for (i = 0; wenv[i]; i++)
+	for (i = 0; wenv[i]; i++) {
 		environ[i] = wcstoutfdup_startup(buffer, wenv[i], maxlen);
+		if (!strncasecmp(environ[i], "MSYS2_TZ=", 9)) {
+			char *to_free = environ[i];
+			environ[i] = xstrdup(to_free + 6);
+			free(to_free);
+		}
+	}
 	environ[i] = NULL;
 	free(buffer);