diff --git a/nmostesting/IS05Utils.py b/nmostesting/IS05Utils.py
index 540038f6..32b3be6c 100644
--- a/nmostesting/IS05Utils.py
+++ b/nmostesting/IS05Utils.py
@@ -31,13 +31,13 @@ class IS05Utils(NMOSUtils):
     def __init__(self, url):
         NMOSUtils.__init__(self, url)
 
-    def get_valid_transports(self, api_version):
+    def get_valid_transports(self, api_version, include_transports_without_transport_file=True):
         """Identify the valid transport types for a given version of IS-05"""
         valid_transports = ["urn:x-nmos:transport:rtp",
                             "urn:x-nmos:transport:rtp.mcast",
                             "urn:x-nmos:transport:rtp.ucast",
                             "urn:x-nmos:transport:dash"]
-        if self.compare_api_version(api_version, "v1.1") >= 0:
+        if self.compare_api_version(api_version, "v1.1") >= 0 and include_transports_without_transport_file:
             valid_transports.append("urn:x-nmos:transport:websocket")
             valid_transports.append("urn:x-nmos:transport:mqtt")
         return valid_transports
diff --git a/nmostesting/suites/IS0502Test.py b/nmostesting/suites/IS0502Test.py
index 6ac820e9..c21abd93 100644
--- a/nmostesting/suites/IS0502Test.py
+++ b/nmostesting/suites/IS0502Test.py
@@ -579,7 +579,8 @@ def test_13(self, test):
             return test.FAIL(result)
 
         try:
-            valid_transports = self.is05_utils.get_valid_transports(self.apis[CONN_API_KEY]["version"])
+            valid_transports = self.is05_utils.get_valid_transports(
+                self.apis[CONN_API_KEY]["version"], include_transports_without_transport_file=False)
 
             access_error = False