diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index b945e86..82abf2a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -35,7 +35,7 @@ jobs:
           ./e 'CXX=${{ matrix.cxx }}'
           ./e 'CXXFLAGS=-Wall -Wextra -pedantic' # XXX: Add -Werror
           ./e 'CMAKE_ARGS=-DSDL2PP_ENABLE_LIVE_TESTS=NO'  # no ability to run live tests in CI (SDL_InitSubsystem failed: x11 not available with xvfb)
-          ./e --if ${{ matrix.xxx == 'clang++' }} 'CXXFLAGS+=-Wno-self-assign-overloaded'  # explicit self-assignment tests
+          ./e --if ${{ matrix.cxx == 'clang++' }} 'CXXFLAGS+=-Wno-self-assign-overloaded'  # explicit self-assignment tests
           ./e --if ${{ contains(matrix.features, 'coverage') }} 'CXXFLAGS+=--coverage' 'LDFLAGS+=--coverage'
           ./e --if ${{ contains(matrix.features, 'nooptlibs') }} 'CMAKE_ARGS+=-DSDL2PP_WITH_IMAGE=NO -DSDL2PP_WITH_MIXER=NO -DSDL2PP_WITH_TTF=NO'
           ./e --if ${{ contains(matrix.features, 'static') }} 'CMAKE_ARGS+=-DSDL2PP_STATIC=YES'