diff --git a/.github/workflows/GnuTests.yml b/.github/workflows/GnuTests.yml
index 3b332a51c..1f24f3045 100644
--- a/.github/workflows/GnuTests.yml
+++ b/.github/workflows/GnuTests.yml
@@ -137,6 +137,8 @@ jobs:
             echo "::error ::Failed to find summary of test results (missing '${SUITE_LOG_FILE}'); failing early"
             exit 1
           fi
+          # Compress logs before upload (fails otherwise)
+          gzip ${{ steps.vars.outputs.TEST_LOGS_GLOB }}
     - name: Reserve SHA1/ID of 'test-summary'
       uses: actions/upload-artifact@v2
       with: