diff --git a/tests/unit/test_protobuf_binary_serialization.py b/tests/unit/test_protobuf_binary_serialization.py
index dcd1c5be3..6950066d3 100644
--- a/tests/unit/test_protobuf_binary_serialization.py
+++ b/tests/unit/test_protobuf_binary_serialization.py
@@ -66,8 +66,8 @@
 option java_multiple_files = true;
 option objc_class_prefix = "TDD";
 option csharp_namespace = "Tech.Dojo.Dsp.V1";
-option php_namespace = "Tech\\Dojo\\Dsp\\V1";
-option php_metadata_namespace = "Tech\\Dojo\\Dsp\\V1\\GPBMetadata";
+option php_namespace = "Tech\\\\Dojo\\\\Dsp\\\\V1";
+option php_metadata_namespace = "Tech\\\\Dojo\\\\Dsp\\\\V1\\\\GPBMetadata";
 option ruby_package = "Tech::Dojo::Dsp::V1";
 
 message EventKey {