diff --git a/.github/workflows/emscripten.yml b/.github/workflows/emscripten.yml
index 0bc05c2..4a1540e 100644
--- a/.github/workflows/emscripten.yml
+++ b/.github/workflows/emscripten.yml
@@ -31,7 +31,7 @@ jobs:
       run: |
         mkdir -p out/wasm
         cd out/wasm
-        emcmake cmake -DCMAKE_BUILD_TYPE=Release ../../
+        emcmake cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_COMPILE_WARNING_AS_ERROR=YES ../../
         make -j4
         mkdir system3
         mv system3.* system3/
diff --git a/.github/workflows/windows-msvc.yml b/.github/workflows/windows-msvc.yml
index fad972b..073a20e 100644
--- a/.github/workflows/windows-msvc.yml
+++ b/.github/workflows/windows-msvc.yml
@@ -24,7 +24,7 @@ jobs:
       run: |
         mkdir out
         cd out
-        cmake -G "Visual Studio 17 2022" -A ${{ matrix.arch }} ../
+        cmake -G "Visual Studio 17 2022" -A ${{ matrix.arch }} -DCMAKE_COMPILE_WARNING_AS_ERROR=YES ../
         cmake --build . --config Release
         cmake --install . --prefix artifacts
         cp ../COPYING.txt artifacts/
diff --git a/.github/workflows/windows.yml b/.github/workflows/windows.yml
index 1166a56..eea8927 100644
--- a/.github/workflows/windows.yml
+++ b/.github/workflows/windows.yml
@@ -33,5 +33,5 @@ jobs:
       run: |
         mkdir -p out/debug
         cd out/debug
-        cmake -G"Ninja" -DCMAKE_BUILD_TYPE=Debug ../../
+        cmake -G"Ninja" -DCMAKE_BUILD_TYPE=Debug -DCMAKE_COMPILE_WARNING_AS_ERROR=YES ../../
         ninja