diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 44e0b6e..2418272 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -50,10 +50,12 @@ jobs:
       run: openscad --info
       continue-on-error: true
 
-    - name: Run Unit Tests
-      shell: bash
-      working-directory: ./tests
-      run: python3 -m unittest
+    - name: Run Unit Tests (Headless)
+      uses: coactions/setup-xvfb@6b00cf1889f4e1d5a48635647013c0508128ee1a
+      with:
+        shell: bash
+        working-directory: ./tests
+        run: python3 -m unittest
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
diff --git a/tests/openscad_runner.py b/tests/openscad_runner.py
index e635397..ac586d3 100644
--- a/tests/openscad_runner.py
+++ b/tests/openscad_runner.py
@@ -117,7 +117,7 @@ class OpenScadRunner:
         #'--hardwarnings', # Does not work when setting variables by using functions
         #'--enable=fast-csg', # Requires Beta version of OpenSCAD
         #'--enable=predictible-output', # Requires Beta version of OpenSCAD
-        '--render=true'  # Required on headless systems
+        #'--render=true'  # Fully render geometry for images, instead of using fast preview mode.
         '--imgsize=1280,720',
         '--view=axes',
         '--projection=ortho',