diff --git a/lib/libfetch/http.c b/lib/libfetch/http.c
index b2feedbcd0bf..cbbb8a8d351f 100644
--- a/lib/libfetch/http.c
+++ b/lib/libfetch/http.c
@@ -876,6 +876,12 @@ http_parse_mtime(const char *p, time_t *mtime)
 	strncpy(locale, setlocale(LC_TIME, NULL), sizeof(locale));
 	setlocale(LC_TIME, "C");
 	r = strptime(p, "%a, %d %b %Y %H:%M:%S GMT", &tm);
+	/*
+	 * Some proxies use UTC in response, but it should still be
+	 * parsed. RFC2616 states GMT and UTC are exactly equal for HTTP.
+	 */
+	if (r == NULL)
+		r = strptime(p, "%a, %d %b %Y %H:%M:%S UTC", &tm);
 	/* XXX should add support for date-2 and date-3 */
 	setlocale(LC_TIME, locale);
 	if (r == NULL)