diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cd83942b96f..9d0bc384102 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -226,6 +226,8 @@ jobs:
       - uses: taiki-e/install-action@v2
         with:
           tool: nextest
+      - name: Make `system` scope nonempty for "GitInstallation" tests
+        run: git config --system gitoxide.imaginary.arbitraryVariable arbitraryValue
       - name: Test (nextest)
         run: cargo nextest run --workspace --no-fail-fast