diff --git a/ext/opcache/tests/jit/fetch_dim_r_001.phpt b/ext/opcache/tests/jit/fetch_dim_r_001.phpt
index 3ff56263db683..c33a4f9d28571 100644
--- a/ext/opcache/tests/jit/fetch_dim_r_001.phpt
+++ b/ext/opcache/tests/jit/fetch_dim_r_001.phpt
@@ -18,7 +18,7 @@ function foo() {
     var_dump($a["2"]);
     var_dump($a[false]);
     var_dump($a[true]);
-    var_dump($a[null]);
+    var_dump($a['']);
     var_dump($a["ab"]);
     $x = "a";
     $y = "b";