diff --git a/components/style/properties/longhand/column.mako.rs b/components/style/properties/longhand/column.mako.rs
index c45ce687a03..897b95d17c4 100644
--- a/components/style/properties/longhand/column.mako.rs
+++ b/components/style/properties/longhand/column.mako.rs
@@ -63,7 +63,8 @@ ${helpers.predefined_type(
 ${helpers.single_keyword("column-span", "none all",
                          products="gecko", animation_value_type="discrete",
                          gecko_pref="layout.css.column-span.enabled",
-                         spec="https://drafts.csswg.org/css-multicol/#propdef-column-span")}
+                         spec="https://drafts.csswg.org/css-multicol/#propdef-column-span",
+                         extra_prefixes="moz")}
 
 ${helpers.single_keyword("column-rule-style",
                          "none hidden dotted dashed solid double groove ridge inset outset",