diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index f3dd730..8c8d715 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -33,6 +33,8 @@ jobs:
       - run: go test ./...
       - name: Anti-flake check (vpnruntime)
         run: go test ./internal/vpnruntime -count=20
+      - name: Targeted anti-flake (parallel flow window)
+        run: go test ./internal/vpnruntime -run TestFabricClientPacketIngressParallelFlowWindowDoesNotBlockIndependentChannel -count=50 -timeout=60s
       - name: Concurrency check (vpnruntime race)
         run: go test -race ./internal/vpnruntime