diff --git a/components/style/properties/longhand/column.mako.rs b/components/style/properties/longhand/column.mako.rs
index 13ae02987a0..a4da425d0a7 100644
--- a/components/style/properties/longhand/column.mako.rs
+++ b/components/style/properties/longhand/column.mako.rs
@@ -31,7 +31,6 @@ ${helpers.predefined_type(
 
 
 <%
-# FIXME(#20498): Servo should support percentages in column-gap.
 col_gap_type = "NonNegativeLengthOrPercentageOrNormal"
 %>
 ${helpers.predefined_type(