diff --git a/tests/closures_basic.phpt b/tests/closures_basic.phpt
index acf3357..ac76762 100644
--- a/tests/closures_basic.phpt
+++ b/tests/closures_basic.phpt
@@ -15,7 +15,7 @@ try {
 }
 ?>
 ===EOF===
---EXPECT--
-[object Closure]
+--EXPECTF--
+[object %s]
 Hello foobar, I'm Closure!
 ===EOF===
diff --git a/tests/closures_dynamic.phpt b/tests/closures_dynamic.phpt
index e74d6d1..bfa597b 100644
--- a/tests/closures_dynamic.phpt
+++ b/tests/closures_dynamic.phpt
@@ -24,7 +24,7 @@ try {
 }
 ?>
 ===EOF===
---EXPECT--
-[object Closure]
+--EXPECTF--
+[object %s]
 Hello world
 ===EOF===
diff --git a/tests/datetime_pass.phpt b/tests/datetime_pass.phpt
index a2749fa..d176039 100644
--- a/tests/datetime_pass.phpt
+++ b/tests/datetime_pass.phpt
@@ -23,7 +23,7 @@ $a->executeString('print(PHP.var.toString()); print("\n");');
 
 ?>
 ===EOF===
---EXPECT--
+--EXPECTF--
 Wed, 19 Mar 2014 14:37:11 GMT
-[object DateTime]
+[object %s]
 ===EOF===
diff --git a/tests/php_exceptions_006.phpt b/tests/php_exceptions_006.phpt
index 9ccc7d5..8f29d9c 100644
--- a/tests/php_exceptions_006.phpt
+++ b/tests/php_exceptions_006.phpt
@@ -35,6 +35,6 @@ catch(V8JsScriptException $e) {
 --EXPECTF--
 after getNonExceptionObject
 Got V8JsScriptException
-string(34) "php_exceptions_006:3: [object Foo]"
+string(%d) "php_exceptions_006:3: [object %s]"
 NULL
 ===EOF===