diff --git a/python-cartopy.spec b/python-cartopy.spec
index 28c8cbc..b1fadb0 100644
--- a/python-cartopy.spec
+++ b/python-cartopy.spec
@@ -90,16 +90,18 @@ export FORCE_CYTHON=1 SETUPTOOLS_SCM_PRETEND_VERSION=%{version}
 %install
 %pyproject_install
 
-# Remove C++ source files installed into site-packages
+# Remove C++ and Cython source files installed into site-packages
 find %{buildroot}%{python3_sitearch}/cartopy/ -name "*.cpp" -delete
+find %{buildroot}%{python3_sitearch}/cartopy/ -name "*.pyx" -delete
 
 # Fix shebang in non-executable script
 sed -i -e '/^#!/d' %{buildroot}%{python3_sitearch}/cartopy/feature/download/__main__.py
 
 %pyproject_save_files -l %{srcname}
 
-# Remove deleted C++ source files from pyproject_files list
+# Remove deleted C++ and Cython source files from pyproject_files list
 sed -i '/trace\.cpp/d' %{pyproject_files}
+sed -i '/trace\.pyx/d' %{pyproject_files}
 
 mkdir -p %{buildroot}%{_datadir}/cartopy/shapefiles/natural_earth/
 for theme in physical cultural; do