1 files changed, 3 insertions, 0 deletions
diff --git a/time.c b/time.c
index 044a049981..4af193d19a 100644
--- a/time.c
+++ b/time.c
@@ -4198,6 +4198,9 @@ time_zone_name(const char *zone)
     if (!rb_enc_str_asciionly_p(name)) {
 	name = rb_external_str_with_enc(name, rb_locale_encoding());
     }
+    else {
+	rb_enc_associate(name, rb_usascii_encoding());
+    }
     return name;
 }