diff --git a/tests/test_06_math/test_613_is_point_in_polygon_2d.py b/tests/test_06_math/test_613_is_point_in_polygon_2d.py
index 4e736faa1..251fddc3b 100644
--- a/tests/test_06_math/test_613_is_point_in_polygon_2d.py
+++ b/tests/test_06_math/test_613_is_point_in_polygon_2d.py
@@ -2,14 +2,16 @@
 # License: MIT License
 import pytest
 from ezdxf.math import Vec2, is_convex_polygon_2d
-
 from ezdxf.math._construct import is_point_in_polygon_2d  # Python version
+from ezdxf.acc import USE_C_EXT
 
 is_point_in_polygon_cy = is_point_in_polygon_2d
-try:  # Cython version
-    from ezdxf.acc.construct import is_point_in_polygon_2d as is_point_in_polygon_cy
-except ImportError:
-    pass
+
+if USE_C_EXT:
+    try:  # Cython version
+        from ezdxf.acc.construct import is_point_in_polygon_2d as is_point_in_polygon_cy
+    except ImportError:
+        pass
 
 
 def test_inside_horizontal_box():