diff --git a/.github/workflows/emulated.yml b/.github/workflows/emulated.yml
index 0a5411d27..9b976e257 100644
--- a/.github/workflows/emulated.yml
+++ b/.github/workflows/emulated.yml
@@ -61,7 +61,7 @@ jobs:
                   -DCMAKE_C_COMPILER=$CC \
                   -DCMAKE_CXX_COMPILER=$CXX \
                   -DXSIMD_ENABLE_WERROR=ON \
-                  -DCMAKE_CXX_FLAGS="-DXSIMD_DEFAULT_ARCH=emulated\<128\> -DXSIMD_WITH_EMULATED=1 ${CXXFLAGS}" \
+                  -DCMAKE_CXX_FLAGS="-DXSIMD_DEFAULT_ARCH=emulated\<64\> -DXSIMD_WITH_EMULATED=1 ${CXXFLAGS}" \
                   -G Ninja
     - name: Build
       run: ninja -C _build