1 files changed, 1 insertions, 1 deletions
diff --git a/re.c b/re.c
index fb05e2e892..fc9e830131 100644
--- a/re.c
+++ b/re.c
@@ -937,7 +937,7 @@ rb_match_busy(VALUE match)
 static VALUE
 rb_reg_fixed_encoding_p(VALUE re)
 {
-    if (ENCODING_GET(re) != 0 || FL_TEST(re, KCODE_FIXED))
+    if (!ENCODING_IS_ASCII8BIT(re) || FL_TEST(re, KCODE_FIXED))
         return Qtrue;
     else
         return Qfalse;