diff --git a/.github/workflows/windows_mkspecs.yml b/.github/workflows/windows_mkspecs.yml
index 17e0970..4dc0b48 100644
--- a/.github/workflows/windows_mkspecs.yml
+++ b/.github/workflows/windows_mkspecs.yml
@@ -14,3 +14,9 @@ jobs:
     uses: steinwurf/windows-mkspecs-action/.github/workflows/action.yml@6.0.0
     with:
       extra_resolve_options: ${{ github.event.inputs.extra_resolve_options }}
+
+# Cancel previous in-progress when pushing: https://stackoverflow.com/a/72408109
+concurrency:
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
+  cancel-in-progress: true