diff --git a/.github/workflows/build_linux.yml b/.github/workflows/build_linux.yml
index 31ec7a3..7f99057 100644
--- a/.github/workflows/build_linux.yml
+++ b/.github/workflows/build_linux.yml
@@ -61,6 +61,9 @@ jobs:
     - name: Check Zserio Python tutorial (sources regeneration)
       run: |
         zserio tutorial.zs -python build/gen
+        zserio tutorial.zs -python src -ignoreTimestamps
+        git add --intent-to-add --all -- src
+        git diff --exit-code -- src
         mypy build/gen src/main.py --no-strict-optional
         PYTHONPATH=. pylint build/gen src/main.py \
               --disable=line-too-long,missing-function-docstring,missing-module-docstring \
@@ -74,3 +77,11 @@ jobs:
         PYTHONPATH=build/gen python src/main.py read
         PYTHONPATH=build/gen python src/main.py write_boss
         PYTHONPATH=build/gen python src/main.py read
+
+  keepalive:
+    if: github.event_name == 'schedule'
+    runs-on: ubuntu-latest
+    permissions:
+      actions: write
+    steps:
+      - uses: liskin/gh-workflow-keepalive@v1
diff --git a/.github/workflows/build_windows.yml b/.github/workflows/build_windows.yml
index 7fd3830..73b0815 100644
--- a/.github/workflows/build_windows.yml
+++ b/.github/workflows/build_windows.yml
@@ -64,6 +64,9 @@ jobs:
     - name: Check Zserio Python tutorial (sources regeneration)
       run: |
         zserio tutorial.zs -python build/gen
+        zserio tutorial.zs -python src -ignoreTimestamps
+        git add --intent-to-add --all -- src
+        git diff --exit-code -- src
         mypy build/gen src/main.py --no-strict-optional
         PYTHONPATH=. pylint build/gen src/main.py \
               --disable=line-too-long,missing-function-docstring,missing-module-docstring \
@@ -79,3 +82,11 @@ jobs:
         PYTHONPATH=build/gen python src/main.py write_boss
         PYTHONPATH=build/gen python src/main.py read
       shell: bash
+
+  keepalive:
+    if: github.event_name == 'schedule'
+    runs-on: ubuntu-latest
+    permissions:
+      actions: write
+    steps:
+      - uses: liskin/gh-workflow-keepalive@v1