diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index f878a56017..39f41eb401 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -145,11 +145,10 @@ jobs:
         if: matrix.os == 'macos-15'
         working-directory: asio
         shell: bash
-        env:
-          CXX: clang++-19
         run: |
           source /Users/runner/.envrc
-          cmake --preset=ci-macos
+          which clang++ && clang++ --version
+          CXX=$(brew --prefix llvm@19)/bin/clang++ cmake --preset=ci-macos
 
       - name: Configure ubuntu
         if: matrix.os == 'ubuntu-24.04'