diff --git a/testing/mozharness/configs/unittests/linux_unittest.py b/testing/mozharness/configs/unittests/linux_unittest.py
index 210b49a0d962..a4aeaba0b13c 100644
--- a/testing/mozharness/configs/unittests/linux_unittest.py
+++ b/testing/mozharness/configs/unittests/linux_unittest.py
@@ -287,6 +287,7 @@ config = {
         "https://blobupload.elasticbeanstalk.com",
     ],
     "unstructured_flavors": {"mochitest": ['jetpack'],
+                            "xpcshell": [],
                             "gtest": [],
                             "mozmill": [],
                             "cppunittest": [],
diff --git a/testing/mozharness/configs/unittests/mac_unittest.py b/testing/mozharness/configs/unittests/mac_unittest.py
index 9f99b62e0326..20bbcf9f5916 100644
--- a/testing/mozharness/configs/unittests/mac_unittest.py
+++ b/testing/mozharness/configs/unittests/mac_unittest.py
@@ -239,6 +239,7 @@ config = {
         "https://blobupload.elasticbeanstalk.com",
     ],
     "unstructured_flavors": {"mochitest": ['jetpack'],
+                            "xpcshell": [],
                             "gtest": [],
                             "mozmill": [],
                             "cppunittest": [],
diff --git a/testing/mozharness/configs/unittests/win_unittest.py b/testing/mozharness/configs/unittests/win_unittest.py
index b273312e5a1d..bcdbabf7db9a 100644
--- a/testing/mozharness/configs/unittests/win_unittest.py
+++ b/testing/mozharness/configs/unittests/win_unittest.py
@@ -264,6 +264,7 @@ config = {
         "https://blobupload.elasticbeanstalk.com",
     ],
     "unstructured_flavors": {"mochitest": ['jetpack'],
+                            "xpcshell": [],
                             "gtest": [],
                             "mozmill": [],
                             "cppunittest": [],
diff --git a/testing/xpcshell/runxpcshelltests.py b/testing/xpcshell/runxpcshelltests.py
index 29922e8d4e4d..86199831c912 100755
--- a/testing/xpcshell/runxpcshelltests.py
+++ b/testing/xpcshell/runxpcshelltests.py
@@ -1006,7 +1006,7 @@ class XPCShellTests(object):
                 if version >= LooseVersion("5.0.0"):
                     nodeBin = localPath
             except (subprocess.CalledProcessError, OSError), e:
-                self.log.warning('Could not retrieve node version: %s' % str(e))
+                self.log.error('Could not retrieve node version: %s' % str(e))
 
         if os.getenv('MOZ_ASSUME_NODE_RUNNING', None):
             self.log.info('Assuming required node servers are already running')