diff --git a/src/backend/access/external/url.c b/src/backend/access/external/url.c
index a79a9027a90bbe711c0765e84da232d855650d4c..8077cfcef2fd94af11c56baa052713dcec8d9bc0 100644
--- a/src/backend/access/external/url.c
+++ b/src/backend/access/external/url.c
@@ -2492,12 +2492,7 @@ url_rewind(URL_FILE *file, const char *relname)
 			break;
 
 		case CFTYPE_EXEC:
-			/* we'll need to execute the command again */
-			assert(0); /* There is no way the following code is right. */
-			url_fclose(file, true, relname);
-
-			/* most of these are null fo us. */
-			url_fopen(url, false, NULL, NULL, NULL, 0);
+			elog(ERROR, "Rescan is not supported for web external table: %s", relname);
 			break;
 
 #ifdef USE_CURL