diff --git a/pyproject.toml b/pyproject.toml
index 51b4e156..7dd324d7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -78,7 +78,10 @@ skip = ".git,*.ipynb"
 
 
 [tool.pytest.ini_options]
-addopts = "-ra -v --doctest-modules --doctest-continue-on-failure --import-mode=importlib"
+addopts = "-ra -v --doctest-modules --doctest-continue-on-failure --import-mode=importlib --strict-markers"
+markers = [
+    "image: plotter rendering image test",
+]
 minversion = "6.0"
 doctest_optionflags = "NORMALIZE_WHITESPACE ELLIPSIS NUMBER"
 testpaths = "tests"
diff --git a/tests/plotting/test_examples.py b/tests/plotting/test_examples.py
index c72ed139..9625908c 100644
--- a/tests/plotting/test_examples.py
+++ b/tests/plotting/test_examples.py
@@ -1,5 +1,6 @@
 """Unit-tests for :mod:`geovista.examples`."""
 
+import pytest
 import pyvista as pv
 
 from geovista.examples import earthquakes
@@ -7,6 +8,7 @@
 pv.OFF_SCREEN = True
 
 
+@pytest.mark.image
 def test_earthquakes(verify_image_cache):
     """Image test of earthquakes example."""
     verify_image_cache.high_variance_test = True