diff --git a/.github/workflows/ci-workflow.yml b/.github/workflows/ci-workflow.yml
index 59131ec5..19b1175d 100644
--- a/.github/workflows/ci-workflow.yml
+++ b/.github/workflows/ci-workflow.yml
@@ -154,6 +154,9 @@ jobs:
 
     - name: Get machine name
       run: echo "Machine name $RUNNER_NAME"
+      
+    - name: Install ninja-build
+      run: brew install ninja
 
     # \bug DYLD_LIBRARY_PATH is not being set here?
     - name: Setup environment
@@ -212,6 +215,9 @@ jobs:
 
     - name: Get machine name
       run: echo "Machine name $RUNNER_NAME"
+      
+    - name: Install ninja-build
+      run: brew install ninja
 
     # \bug DYLD_LIBRARY_PATH is not being set here?
     - name: Setup environment
diff --git a/etc/macOS/macos-build-gha.sh b/etc/macOS/macos-build-gha.sh
index e31d0b9c..2dba2944 100644
--- a/etc/macOS/macos-build-gha.sh
+++ b/etc/macOS/macos-build-gha.sh
@@ -7,6 +7,7 @@ BUILD_TYPE=$1
 mkdir build
 cd build
 cmake ../etc/SuperBuild \
+    -G Ninja \
     -DCMAKE_BUILD_TYPE=$BUILD_TYPE \
     -DCMAKE_INSTALL_PREFIX=$PWD/install \
     -DCMAKE_PREFIX_PATH=$PWD/install \