diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f1e2b66bf..aac5d2345 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -19,6 +19,7 @@ jobs:
       - run: make GO_ONLY=1 SKIP_GOLANGCI_LINT=1
       - run: go test ./tsdb/ -test.tsdb-isolation=false
       - run: go test --tags=stringlabels ./...
+      - run: go test --tags=dedupelabels ./...
       - run: GOARCH=386 go test ./cmd/prometheus
       - run: make -C documentation/examples/remote_storage
       - run: make -C documentation/examples