diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index a06804f..0a74413 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -81,7 +81,7 @@ jobs:
       # Note the current convention is to use the -S and -B options here to specify source
       # and build directories, but this is only available with CMake 3.13 and higher.
       # The CMake binaries on the Github Actions machines are (as of this writing) 3.12
-      run: CMAKE_OSX_ARCHITECTURES=arm64;x86_64 cmake $GITHUB_WORKSPACE -D CMAKE_BUILD_TYPE=$BUILD_TYPE -D BUILD_STATIC=${{matrix.linkage == 'static'}}
+      run: CMAKE_OSX_ARCHITECTURES="arm64;x86_64" cmake $GITHUB_WORKSPACE -D CMAKE_BUILD_TYPE=$BUILD_TYPE -D BUILD_STATIC=${{matrix.linkage == 'static'}}
 
     - name: Build
       working-directory: ${{github.workspace}}/build