diff --git a/src/common/pl/plpgsql/src/gram.y b/src/common/pl/plpgsql/src/gram.y
index d7fbd1755..f87c05d55 100755
--- a/src/common/pl/plpgsql/src/gram.y
+++ b/src/common/pl/plpgsql/src/gram.y
@@ -4047,7 +4047,7 @@ stmt_execsql			: K_ALTER
             }
         | T_ARRAY_EXTEND
             {
-                check_table_index(yylval.wdatum.datum, "trim");
+                check_table_index(yylval.wdatum.datum, "extend");
                 int dno = yylval.wdatum.dno;
                 StringInfoData sqlBuf;