diff --git a/.github/workflows/macos.yml b/.github/workflows/macos.yml
index cd91a70..118c4ca 100644
--- a/.github/workflows/macos.yml
+++ b/.github/workflows/macos.yml
@@ -37,19 +37,19 @@ jobs:
               brew install llvm@18 ninja
           - compiler: LLVM-Clang-19
             cxx: $(brew --prefix llvm@19)/bin/clang++
-            build_module: false
+            build_module: true
             install: |
               brew install llvm@19 ninja
           - compiler: LLVM-Clang-20
             cxx: $(brew --prefix llvm@20)/bin/clang++
-            build_module: false
+            build_module: true
             install: |
               brew update
               brew install llvm@20 ninja
           - compiler: LLVM-Clang-21
             cxx: $(brew --prefix llvm@21)/bin/clang++
             ldflags: -L$(brew --prefix llvm@21)/lib/c++
-            build_module: false
+            build_module: true
             install: |
               brew update
               brew install llvm@21 ninja
@@ -71,6 +71,7 @@ jobs:
               -DCMAKE_CXX_EXTENSIONS=Off \
               -DCMAKE_COMPILE_WARNING_AS_ERROR=On \
               -DCMAKE_LINK_WARNING_AS_ERROR=On \
+              -DCMAKE_OSX_SYSROOT=$(xcrun --sdk macosx --show-sdk-path) \
               -DTCB_POINTER_BUILD_MODULE=${{matrix.build_module}}
 
     - name: Build