--- a/testing/marionette/harness/marionette_harness/tests/unit/test_capabilities.py
+++ b/testing/marionette/harness/marionette_harness/tests/unit/test_capabilities.py
@@ -43,17 +43,20 @@ class TestCapabilities(MarionetteTestCas
 
     def test_additional_capabilities(self):
         self.assertIn("moz:processID", self.caps)
         self.assertEqual(self.caps["moz:processID"], self.appinfo["processID"])
         self.assertEqual(self.marionette.process_id, self.appinfo["processID"])
 
         self.assertIn("moz:profile", self.caps)
         if self.marionette.instance is not None:
-            current_profile = self.marionette.instance.runner.profile.profile
+            if self.caps["browserName"] == "fennec":
+                current_profile = self.marionette.instance.runner.device.app_ctx.remote_profile
+            else:
+                current_profile = self.marionette.instance.runner.profile.profile
             self.assertEqual(self.caps["moz:profile"], current_profile)
             self.assertEqual(self.marionette.profile, current_profile)
 
         self.assertIn("moz:accessibilityChecks", self.caps)
         self.assertFalse(self.caps["moz:accessibilityChecks"])
         self.assertIn("specificationLevel", self.caps)
         self.assertEqual(self.caps["specificationLevel"], 0)