diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index e2e15da4b..ea0bf7ec5 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -22,7 +22,7 @@ on:
 
 jobs:
   build:
-    if: ${{ github.repository == 'rclone/rclone' || github.event.inputs.manual == 'true' }}
+    if: ${{ github.event.inputs.manual == 'true' || (github.repository == 'rclone/rclone' && (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name)) }}
     timeout-minutes: 60
     strategy:
       fail-fast: false
@@ -220,7 +220,7 @@ jobs:
         if: matrix.deploy && github.head_ref == '' && github.repository == 'rclone/rclone'
 
   lint:
-    if: ${{ github.repository == 'rclone/rclone' || github.event.inputs.manual == 'true' }}
+    if: ${{ github.event.inputs.manual == 'true' || (github.repository == 'rclone/rclone' && (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name)) }}
     timeout-minutes: 30
     name: "lint"
     runs-on: ubuntu-latest
@@ -249,7 +249,7 @@ jobs:
         run: govulncheck ./...
 
   android:
-    if: ${{ github.repository == 'rclone/rclone' || github.event.inputs.manual == 'true' }}
+    if: ${{ github.event.inputs.manual == 'true' || (github.repository == 'rclone/rclone' && (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name)) }}
     timeout-minutes: 30
     name: "android-all"
     runs-on: ubuntu-latest