diff --git a/.github/workflows/check-generated-at-parser.yml b/.github/workflows/check-generated-at-parser.yml
new file mode 100644
index 000000000000..2f1410e3f23f
--- /dev/null
+++ b/.github/workflows/check-generated-at-parser.yml
@@ -0,0 +1,42 @@
+name: Check Generated AT Parser
+
+on:
+  pull_request:
+    paths:
+      - 'lib/at_parser/at_match.re'
+
+jobs:
+  compliance_job:
+    runs-on: ubuntu-latest
+    name: Check Generated AT Parser
+    steps:
+    - name: Update PATH for west
+      run: |
+        echo "$HOME/.local/bin" >> $GITHUB_PATH
+
+    - name: Checkout sources
+      uses: actions/checkout@v4
+      with:
+        ref: ${{ github.event.pull_request.head.sha }}
+        path: ncs/nrf
+        fetch-depth: 0
+        persist-credentials: false
+
+    - name: Install dependencies
+      run: |
+        sudo apt-get install re2c=3.0-1
+
+    - name: Generate lexer
+      working-directory: ncs/nrf/lib/at_parser
+      run: |
+        re2c at_match.re -o at_match.c -W --tags --no-debug-info --no-generation-date --no-version
+
+    - name: Compare lexers
+      working-directory: ncs/nrf/lib/at_parser
+      run: |
+        if diff -q at_match.c generated/at_match.c > /dev/null; then
+          echo "Lexer is up to date."
+        else
+          echo "Lexer is not up to date. Please re-generate the lexer and update the PR."
+          exit 1
+        fi