1 files changed, 1 insertions, 0 deletions
diff --git a/re.c b/re.c
index be815f527f..8f2694b817 100644
--- a/re.c
+++ b/re.c
@@ -3562,6 +3562,7 @@ Init_Regexp(void)
     rb_define_const(rb_cRegexp, "EXTENDED", INT2FIX(ONIG_OPTION_EXTEND));
     rb_define_const(rb_cRegexp, "MULTILINE", INT2FIX(ONIG_OPTION_MULTILINE));
     rb_define_const(rb_cRegexp, "FIXEDENCODING", INT2FIX(ARG_ENCODING_FIXED));
+    rb_define_const(rb_cRegexp, "NOENCODING", INT2FIX(ARG_ENCODING_NONE));
 
     rb_global_variable(&reg_cache);