diff --git a/src/pl/plpgsql/src/pl_exec.c b/src/pl/plpgsql/src/pl_exec.c
index 32f57a3256..a6ee82a951 100644
--- a/src/pl/plpgsql/src/pl_exec.c
+++ b/src/pl/plpgsql/src/pl_exec.c
@@ -2221,6 +2221,7 @@ exec_stmt_return_next(PLpgSQL_execstate *estate,
 					{
 						tuple = do_convert_tuple(tuple, tupmap);
 						free_conversion_map(tupmap);
+						free_tuple = true;
 					}
 				}
 				break;