diff --git a/.forgejo/workflows/build.yml b/.forgejo/workflows/build.yml
index c8553ec..b9d288f 100644
--- a/.forgejo/workflows/build.yml
+++ b/.forgejo/workflows/build.yml
@@ -6,9 +6,22 @@ on:
   pull_request:
 
 jobs:
+  syntax:
+    name: Check syntax
+    runs-on: docker
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+      - name: Install dependencies
+        uses: apt update && apt install xmllib2
+      - name: Check syntax of Python file
+        run: python3 -m py_compile sweecrypt-gtk.py
+      - name: Check syntax of XML file
+        run: xmllint --format sweecrypt-gtk.ui
   x11:
     name: Test the application
     runs-on: docker
+    needs: syntax
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
@@ -38,6 +51,7 @@ jobs:
   apt:
     name: Build Debian Package
     runs-on: docker
+    needs: syntax
     steps:
     - uses: actions/checkout@v4
     - uses: actions/setup-python@v5