diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 63411c2..24859f4 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -9,9 +9,9 @@ jobs:
     name: Unit tests
     uses: apple/swift-nio/.github/workflows/unit_tests.yml@main
     with:
-      linux_5_9_arguments_override: "--explicit-target-dependency-import-check error"
-      linux_5_10_arguments_override: "--explicit-target-dependency-import-check error"
-      linux_6_0_arguments_override: "--explicit-target-dependency-import-check error"
+      linux_5_9_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+      linux_5_10_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
+      linux_6_0_arguments_override: "-Xswiftc -warnings-as-errors --explicit-target-dependency-import-check error"
       linux_nightly_6_0_arguments_override: "--explicit-target-dependency-import-check error"
       linux_nightly_main_arguments_override: "--explicit-target-dependency-import-check error"