diff --git a/Lib/glyphsLib/featureWriters/markFeatureWriter.py b/Lib/glyphsLib/featureWriters/markFeatureWriter.py
index c0a7bbb90..804a7284c 100644
--- a/Lib/glyphsLib/featureWriters/markFeatureWriter.py
+++ b/Lib/glyphsLib/featureWriters/markFeatureWriter.py
@@ -10,8 +10,8 @@
     MarkToBasePos,
     NamedAnchor,
     MarkFeatureWriter,
-    quantize,
 )
+from ufo2ft.util import quantize
 
 
 class ContextuallyAwareNamedAnchor(NamedAnchor):