diff --git a/src/pl/plpgsql/src/pl_exec.c b/src/pl/plpgsql/src/pl_exec.c
index 76dd369468d..eaa78cf7413 100644
--- a/src/pl/plpgsql/src/pl_exec.c
+++ b/src/pl/plpgsql/src/pl_exec.c
@@ -2068,13 +2068,13 @@ exec_stmt_fori(PLpgSQL_execstate *estate, PLpgSQL_stmt_fori *stmt)
 		 */
 		if (stmt->reverse)
 		{
-			if ((int32) (loop_value - step_value) > loop_value)
+			if (loop_value < (PG_INT32_MIN + step_value))
 				break;
 			loop_value -= step_value;
 		}
 		else
 		{
-			if ((int32) (loop_value + step_value) < loop_value)
+			if (loop_value > (PG_INT32_MAX - step_value))
 				break;
 			loop_value += step_value;
 		}