diff --git a/Lib/fontParts/base/guideline.py b/Lib/fontParts/base/guideline.py
index 1aa6c781..9c0b3988 100644
--- a/Lib/fontParts/base/guideline.py
+++ b/Lib/fontParts/base/guideline.py
@@ -553,7 +553,7 @@ def _get_color(self) -> QuadrupleCollectionType[IntFloatType]:
         property getter.
 
         :return: A :ref:`type-color` representing the color of the guideline,
-            or :obj:`None`. The value will be normalized 
+            or :obj:`None`. The value will be normalized
             with :func:`normalizers.normalizeColor`.
         :raises NotImplementedError: If the method has not been overridden by a
             subclass.