diff --git a/.github/workflows/build-fast.yml b/.github/workflows/build-fast.yml
index 01730930b5..c8a63bbf7f 100644
--- a/.github/workflows/build-fast.yml
+++ b/.github/workflows/build-fast.yml
@@ -74,7 +74,7 @@ jobs:
             -DCMAKE_BUILD_TYPE="Release" \
             -DCMAKE_INSTALL_PREFIX="${{github.workspace}}/install" \
             -DCMAKE_CXX_COMPILER_LAUNCHER=ccache \
-            -DCMAKE_CXX_FLAGS="-Wall -Wextra -pedantic -Wno-error=deprecated-declarations" \
+            -DCMAKE_CXX_FLAGS="-Werror -Wall -Wextra -pedantic -Wno-error=deprecated-declarations" \
             ..
       - name: Build all
         working-directory: build