follow-up for a6b7aad954680e23e7db81d69a7e8e44583bf8b4. suppress compiler warning.

1 files changed, 3 insertions, 0 deletions

diff --git a/spec/ruby/optional/capi/ext/string_spec.c b/spec/ruby/optional/capi/ext/string_spec.c
index 73b5aba278..a858936243 100644
--- a/spec/ruby/optional/capi/ext/string_spec.c
+++ b/spec/ruby/optional/capi/ext/string_spec.c
@@ -597,6 +597,9 @@ static VALUE string_spec_rb_str_unlocktmp(VALUE self, VALUE str) {
   return rb_str_unlocktmp(str);
 }
 
+VALUE rb_str_to_interned_str(VALUE str);
+VALUE rb_enc_interned_str_cstr(const char *ptr, rb_encoding *enc);
+
 static VALUE string_spec_rb_enc_interned_str_cstr(VALUE self, VALUE str, VALUE enc) {
   rb_encoding *e = NIL_P(enc) ? 0 : rb_to_encoding(enc);
   return rb_enc_interned_str_cstr(RSTRING_PTR(str), e);