diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6bc286d..d90ced9 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -22,6 +22,7 @@ jobs:
   build:
     name: Build thesis PDFs
     runs-on: ubuntu-latest
+    needs: prereq
     container: { image: 'aergus/latex' }
 
     steps: