1 files changed, 1 insertions, 1 deletions
diff --git a/proto.h b/proto.h
index 64adf53a5e..2f5918abec 100644
--- a/proto.h
+++ b/proto.h
@@ -2473,7 +2473,7 @@ STATIC bool	S_utf8_mg_pos_init(pTHX_ SV *sv, MAGIC **mgp, STRLEN **cachep, I32 i
 			__attribute__nonnull__(pTHX_7);
 
 #if defined(PERL_OLD_COPY_ON_WRITE)
-STATIC void	S_sv_release_COW(pTHX_ SV *sv, const char *pvx, STRLEN cur, STRLEN len, U32 hash, SV *after);
+STATIC void	S_sv_release_COW(pTHX_ SV *sv, const char *pvx, STRLEN len, SV *after);
 #endif
 #endif