diff --git a/tests/model_explainability/trustyai_service/drift/conftest.py b/tests/model_explainability/trustyai_service/drift/conftest.py
index 6a54f0fcb..b62e3fac0 100644
--- a/tests/model_explainability/trustyai_service/drift/conftest.py
+++ b/tests/model_explainability/trustyai_service/drift/conftest.py
@@ -44,7 +44,7 @@ def mlserver_runtime(
             "@sha256:68a4cd74fff40a3c4f29caddbdbdc9e54888aba54bf3c5f78c8ffd577c3a1c89",
             "env": [
                 {"name": "MLSERVER_MODEL_IMPLEMENTATION", "value": "{{.Labels.modelClass}}"},
-                {"name": "MLSERVER_HTTP_PORT", "value": Ports.REST_PORT},
+                {"name": "MLSERVER_HTTP_PORT", "value": str(Ports.REST_PORT)},
                 {"name": "MLSERVER_GRPC_PORT", "value": "9000"},
                 {"name": "MODELS_DIR", "value": "/mnt/models/"},
             ],
@@ -64,7 +64,7 @@ def mlserver_runtime(
             "opendatahub.io/recommended-accelerators": '["nvidia.com/gpu"]',
             "opendatahub.io/template-display-name": "KServe MLServer",
             "prometheus.kserve.io/path": "/metrics",
-            "prometheus.io/port": Ports.REST_PORT,
+            "prometheus.io/port": str(Ports.REST_PORT),
             "openshift.io/display-name": "mlserver-1.x",
         },
         label={Labels.OpenDataHub.DASHBOARD: "true"},