diff --git a/tests/basic/timeout_variation_9.phpt b/tests/basic/timeout_variation_9.phpt
index 69b59c25e46de..133fdf6daa580 100644
--- a/tests/basic/timeout_variation_9.phpt
+++ b/tests/basic/timeout_variation_9.phpt
@@ -14,7 +14,7 @@ set_time_limit($t);
 function f()
 {
 	echo "call";
-	busy_wait(4);
+	busy_wait(5);
 }
 
 register_shutdown_function("f");