diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 579822a2..8fe42dff 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -27,21 +27,22 @@ jobs:
         run: sh build.sh
 
       # No point in running the following steps if we are not deploying
+      # See https://github.com/actions/runner/issues/1395 for why fromJSON() is needed
       - name: Install to temp dir
-        if: env.IS_DEPLOY
+        if: fromJSON(env.IS_DEPLOY)
         shell: bash
         run: |
           mkdir TEMPDIR
           sh install.sh TEMPDIR
 
       - name: Create release archive
-        if: env.IS_DEPLOY
+        if: fromJSON(env.IS_DEPLOY)
         shell: bash
         run: tar -C TEMPDIR/tools/agbcc -czf agbcc.tar.gz bin include lib
 
       - name: Upload archive
         uses: actions/upload-artifact@main
-        if: env.IS_DEPLOY
+        if: fromJSON(env.IS_DEPLOY)
         with:
           name: agbcc.tar.gz
           path: agbcc.tar.gz