diff --git a/.github/workflows/clang-tidy.yml b/.github/workflows/clang-tidy.yml
index d291f07e9eec..7213c7def145 100644
--- a/.github/workflows/clang-tidy.yml
+++ b/.github/workflows/clang-tidy.yml
@@ -54,20 +54,20 @@ jobs:
 
       - name: Prepare CMake
         run: |
-          cmake -S . -B cmake.output -G "Unix Makefiles" -DHAVE_RULES=On -DBUILD_TESTS=On -DBUILD_GUI=On -DUSE_QT6=On -DWITH_QCHART=On -DENABLE_CHECK_INTERNAL=On -DCMAKE_GLOBAL_AUTOGEN_TARGET=On -DCPPCHK_GLIBCXX_DEBUG=Off
+          cmake -S . -B cmake.output -G "Unix Makefiles" -DHAVE_RULES=On -DBUILD_TESTS=On -DBUILD_GUI=On -DUSE_QT6=On -DWITH_QCHART=On -DENABLE_CHECK_INTERNAL=On -DCMAKE_GLOBAL_AUTOGEN_TARGET=On -DCPPCHK_GLIBCXX_DEBUG=Off WARNINGS_ARE_ERRORS=On
         env:
           CC: clang-20
           CXX: clang++-20
 
       - name: Prepare CMake dependencies
         run: |
+          # make sure the auto-generated GUI sources exist
+          make -C cmake.output autogen
           # make sure the precompiled headers exist
           make -C cmake.output/cli cmake_pch.hxx.pch
           make -C cmake.output/gui cmake_pch.hxx.pch
           make -C cmake.output/lib cmake_pch.hxx.pch
           make -C cmake.output/test cmake_pch.hxx.pch
-          # make sure the auto-generated GUI sources exist
-          make -C cmake.output autogen
 
       - name: Clang-Tidy
         run: |