diff --git a/lib/vtls/gskit.c b/lib/vtls/gskit.c
index 9b5fbe4dd6..43456172a3 100644
--- a/lib/vtls/gskit.c
+++ b/lib/vtls/gskit.c
@@ -293,27 +293,6 @@ static CURLcode set_numeric(struct Curl_easy *data,
 }
 
 
-static CURLcode set_callback(struct Curl_easy *data,
-                             gsk_handle h, GSK_CALLBACK_ID id, void *info)
-{
-  char buffer[STRERROR_LEN];
-  int rc = gsk_attribute_set_callback(h, id, info);
-
-  switch(rc) {
-  case GSK_OK:
-    return CURLE_OK;
-  case GSK_ERROR_IO:
-    failf(data, "gsk_attribute_set_callback() I/O error: %s",
-          Curl_strerror(errno, buffer, sizeof(buffer)));
-    break;
-  default:
-    failf(data, "gsk_attribute_set_callback(): %s", gsk_strerror(rc));
-    break;
-  }
-  return CURLE_SSL_CONNECT_ERROR;
-}
-
-
 static CURLcode set_ciphers(struct Curl_easy *data,
                             gsk_handle h, unsigned int *protoflags)
 {