diff --git a/tests/bson/bson-enum_error-003.phpt b/tests/bson/bson-enum_error-003.phpt
index 788868437..e78f766fa 100644
--- a/tests/bson/bson-enum_error-003.phpt
+++ b/tests/bson/bson-enum_error-003.phpt
@@ -15,5 +15,5 @@ enum MyEnum implements MongoDB\BSON\Persistable
 ?>
 ===DONE===
 <?php exit(0); ?>
---EXPECTF--
-Fatal error: Enum class MyEnum cannot implement interface MongoDB\BSON\Persistable in %s on line %d
+--EXPECTREGEX--
+Fatal error: Enum class MyEnum cannot implement interface MongoDB\\BSON\\(Persistable|Unserializable) in .+ on line \d+
diff --git a/tests/bson/bson-enum_error-004.phpt b/tests/bson/bson-enum_error-004.phpt
index 3136f0060..32a43d568 100644
--- a/tests/bson/bson-enum_error-004.phpt
+++ b/tests/bson/bson-enum_error-004.phpt
@@ -15,5 +15,5 @@ enum MyBackedEnum: int implements MongoDB\BSON\Persistable
 ?>
 ===DONE===
 <?php exit(0); ?>
---EXPECTF--
-Fatal error: Enum class MyBackedEnum cannot implement interface MongoDB\BSON\Persistable in %s on line %d
+--EXPECTREGEX--
+Fatal error: Enum class MyBackedEnum cannot implement interface MongoDB\\BSON\\(Persistable|Unserializable) in .+ on line \d+