diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 6dff9919a..c8925c0b3 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -148,6 +148,7 @@ jobs:
       run: python3 `which scons` build env_vars=all
         CXX=clang++-12 CC=clang-12 f90_interface=n extra_lib_dirs=/usr/lib/llvm/lib
         -j2 debug=n --debug=time hdf_libdir=$HDF5_LIBDIR hdf_include=$HDF5_INCLUDEDIR
+        warning_flags='-Wall -Werror -Wsuggest-override'
     - name: Test Cantera
       run:
         python3 `which scons` test show_long_tests=yes verbose_tests=yes --debug=time