--- a/taskcluster/ci/test/tests.yml
+++ b/taskcluster/ci/test/tests.yml
@@ -221,16 +221,17 @@ gtest:
     suite: gtest
     treeherder-symbol: tc(GTest)
     e10s: false
     instance-size: xlarge
     run-on-projects:
         by-test-platform:
             linux64-qr/.*: ['mozilla-central', 'try']
             windows.*-pgo/.*: [] # permafails on pgo
+            windows.*-nightly/.*: [] # permafails on nightly too
             default: built-projects
     mozharness:
         script: desktop_unittest.py
         no-read-buildbot-config: true
         config:
             by-test-platform:
                 windows.*:
                     - unittests/win_taskcluster_unittest.py