diff --git a/tests/classes/autoload_012.phpt b/tests/classes/autoload_012.phpt
index cc73f3fd8d2..d6750b760dc 100644
--- a/tests/classes/autoload_012.phpt
+++ b/tests/classes/autoload_012.phpt
@@ -12,4 +12,4 @@ Ensure callback methods in unknown classes trigger autoload.
 --EXPECTF--
 In autoload: string(6) "UndefC"
 
-Warning: call_user_func() expects parameter 1 to be valid callback, string given in %s on line %d
+Warning: call_user_func() expects parameter 1 to be a valid callback, class 'UndefC' not found in %s on line %d
diff --git a/tests/classes/bug27504.phpt b/tests/classes/bug27504.phpt
index c83a7ae0313..5f2c5a03ce7 100644
--- a/tests/classes/bug27504.phpt
+++ b/tests/classes/bug27504.phpt
@@ -20,6 +20,6 @@ Bug #27504 (call_user_func_array allows calling of private/protected methods)
 --EXPECTF--
 Called function foo:bar(1)
 
-Warning: call_user_func_array() expects parameter 1 to be valid callback, array given in %s on line %d
+Warning: call_user_func_array() expects parameter 1 to be a valid callback, cannot access private method foo::bar() in %s on line %d
 
 Fatal error: Call to private method foo::bar() from context '' in %s on line %d