diff --git a/.github/workflows/macos-ci.yml b/.github/workflows/macos-ci.yml
index d47e8032a8..abefeaeecd 100644
--- a/.github/workflows/macos-ci.yml
+++ b/.github/workflows/macos-ci.yml
@@ -82,7 +82,7 @@ jobs:
         env:
           MY_OS_NAME: macos
           COMPILER:   ${{ matrix.compiler }}
-          FLAGS:      "-DCMAKE_FIND_FRAMEWORK=LAST -DENABLE_PIE=${{ matrix.ENABLE_PIE }} -DPython3_ROOT_DIR=${{ matrix.vega-py-setup.outputs.python-path }}"
+          FLAGS:      "-DCMAKE_FIND_FRAMEWORK=LAST -DENABLE_PIE=${{ matrix.ENABLE_PIE }} -DPython3_ROOT_DIR=${{ matrix.vega-py-setup.outputs.python-path }} -DPythonInstalledVia=Homebrew"
           OPENALDIR:  "/usr/local/opt/openal-soft"
           Python3_ROOT_DIR: ${{ matrix.vega-py-setup.outputs.python-path }}
           Python_ROOT_DIR: ${{ matrix.vega-py-setup.outputs.python-path }}
diff --git a/.github/workflows/macos-release.yml b/.github/workflows/macos-release.yml
index 6686d3cbb9..b27326d9eb 100644
--- a/.github/workflows/macos-release.yml
+++ b/.github/workflows/macos-release.yml
@@ -101,7 +101,7 @@ jobs:
         env:
           MY_OS_NAME: macos
           COMPILER:   ${{ matrix.compiler }}
-          FLAGS:      "-DCMAKE_FIND_FRAMEWORK=LAST -DENABLE_PIE=${{ matrix.ENABLE_PIE }} -DPython3_ROOT_DIR=${{ matrix.vega-py-setup.outputs.python-path }}"
+          FLAGS:      "-DCMAKE_FIND_FRAMEWORK=LAST -DENABLE_PIE=${{ matrix.ENABLE_PIE }} -DPython3_ROOT_DIR=${{ matrix.vega-py-setup.outputs.python-path }} -DPythonInstalledVia=Homebrew"
           OPENALDIR:  "$(brew --prefix)/opt/openal-soft"
           Python3_ROOT_DIR: ${{ matrix.vega-py-setup.outputs.python-path }}
           Python_ROOT_DIR: ${{ matrix.vega-py-setup.outputs.python-path }}