diff --git a/components/style/properties/longhands/svg.mako.rs b/components/style/properties/longhands/svg.mako.rs
index f003fa5222e..1a84c1d669f 100644
--- a/components/style/properties/longhands/svg.mako.rs
+++ b/components/style/properties/longhands/svg.mako.rs
@@ -96,6 +96,7 @@ ${helpers.predefined_type(
 ${helpers.single_keyword(
     "mask-mode",
     "match-source alpha luminance",
+    gecko_enum_prefix="StyleMaskMode",
     vector=True,
     products="gecko",
     animation_value_type="discrete",