diff --git a/.github/workflows/lint.yml b/.github/workflows/lint.yml
new file mode 100644
index 000000000..fd0252ea5
--- /dev/null
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,14 @@
+name: Lint
+
+on: [push, pull_request]
+
+jobs:
+  check-format:
+    runs-on: ubuntu-24.04
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+    - name: Run make -C schema fmt
+      run: make -C schema fmt
+    - name: Check for changes
+      run: git diff --exit-code
diff --git a/schema/config-schema.json b/schema/config-schema.json
index cb74342f2..5124def5f 100644
--- a/schema/config-schema.json
+++ b/schema/config-schema.json
@@ -226,14 +226,14 @@
                     "properties": {
                         "initial": {
                             "type": "string",
-			    "pattern": "^[0-9, -]*$"
+                            "pattern": "^[0-9, -]*$"
                         },
                         "final": {
                             "type": "string",
-			    "pattern": "^[0-9, -]*$"
+                            "pattern": "^[0-9, -]*$"
                         }
                     }
-		}
+                }
             }
         },
         "linux": {