diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 6cb35b8..0aaf23f 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -6,6 +6,8 @@ on: [push, pull_request, workflow_dispatch]
 
 jobs:
   generate_ctypes:
+    # Prevent double trigger on my PR: so push for me and PR for forks
+    if: ${{(github.event_name == 'push') || (github.event.pull_request.head.repo.fork)}}
     runs-on: windows-latest
     timeout-minutes: 5
 
@@ -19,7 +21,8 @@ jobs:
         - name: Check generated code can execute
           run: py -c "import windows.generated_def"
   tests:
-    # Not a real dependency : but starting tests when ctypes generation is broken is not useful
+    # Prevent double trigger on my PR: so push for me and PR for forks
+    if: ${{(github.event_name == 'push') || (github.event.pull_request.head.repo.fork)}}
     strategy:
       fail-fast: false
       matrix:
@@ -32,7 +35,7 @@ jobs:
               python-architecture: x86
             - python-bitness-to-test: 64
               python-architecture: x64
-
+    # Not a real dependency : but starting tests when ctypes generation is broken is not useful
     needs: generate_ctypes
     timeout-minutes: 15
     runs-on: ${{ matrix.runs-on }}
@@ -90,4 +93,4 @@ jobs:
           check_name: PyTest Results for ${{ matrix.python-version}}-${{ matrix.python-bitness-to-test}}
           secondary_rate_limit_wait_seconds: 90
           seconds_between_github_writes: 10
-          seconds_between_github_reads: 1
\ No newline at end of file
+          seconds_between_github_reads: 1