diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index ec95e16..e5945a9 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -25,6 +25,8 @@ jobs:
   build_book:
     runs-on: ubuntu-latest
     needs: markdownlint
+    env:
+      BINARIES: ${{ github.event_name == 'push' && (github.ref_name == 'master' || github.ref_name == 'dev') && github.repository == 'okalachev/flix' }}
     steps:
     - uses: actions/checkout@v4
     - name: Install mdBook
@@ -32,7 +34,7 @@ jobs:
     - name: Build book
       run: cd docs && mdbook build
     - name: Wait for Build to complete
-      if: ${{ vars.DOCS_BINARIES == '1' }}
+      if: ${{ env.BINARIES }}
       uses: lewagon/wait-on-check-action@v1.9.1
       with:
         ref: ${{ github.sha }}
@@ -40,7 +42,7 @@ jobs:
         repo-token: ${{ secrets.GITHUB_TOKEN }}
         wait-interval: 30
     - name: Find firmware binaries
-      if: ${{ vars.DOCS_BINARIES == '1' }}
+      if: ${{ env.BINARIES }}
       id: build_run
       run: |
         RUN_ID=$(gh api "repos/${{ github.repository }}/actions/workflows/build.yml/runs?head_sha=${{ github.sha }}&per_page=1" --jq '.workflow_runs[0].id')
@@ -48,7 +50,7 @@ jobs:
       env:
         GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
     - name: Download firmware binaries
-      if: ${{ vars.DOCS_BINARIES == '1' }}
+      if: ${{ env.BINARIES }}
       uses: actions/download-artifact@v4
       with:
         github-token: ${{ secrets.GITHUB_TOKEN }}
@@ -57,7 +59,7 @@ jobs:
         name: firmware-binary
         path: docs/build
     - name: Create shortcuts for firmware binaries
-      if: ${{ vars.DOCS_BINARIES == '1' }}
+      if: ${{ env.BINARIES }}
       working-directory: docs/build
       run: |
         for FQBN in esp32.esp32.*; do