1 files changed, 1 insertions, 1 deletions
diff --git a/re.h b/re.h
index 8690932bb5..ab66352288 100644
--- a/re.h
+++ b/re.h
@@ -31,7 +31,7 @@ struct RMatch {
 
 VALUE rb_reg_regcomp(VALUE);
 long rb_reg_search(VALUE, VALUE, long, long);
-VALUE rb_reg_regsub(VALUE, VALUE, struct re_registers *);
+VALUE rb_reg_regsub(VALUE, VALUE, struct re_registers *, VALUE);
 long rb_reg_adjust_startpos(VALUE, VALUE, long, long);
 void rb_match_busy(VALUE);
 VALUE rb_reg_quote(VALUE);