diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 06b2429..7c98375 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,11 +1,11 @@
 name: "Build and populate cache"
 on:
-  workflow_run:
-    workflows: ["Format / format (pull_request)"]
-    types:
-      - completed
+  pull_request:
+    types: [ labeled ]
+
 jobs:
   tests:
+    if: ${{ github.event.label.name == 'has: formatting' }}
     strategy:
       matrix:
         cachixName: