diff --git a/components/style/properties/counted_unknown_properties.py b/components/style/properties/counted_unknown_properties.py
index 997fd167a07..08905b15721 100644
--- a/components/style/properties/counted_unknown_properties.py
+++ b/components/style/properties/counted_unknown_properties.py
@@ -19,7 +19,6 @@ COUNTED_UNKNOWN_PROPERTIES = [
     "text-size-adjust",
     "-webkit-font-feature-settings",
     "-webkit-user-drag",
-    "-webkit-clip-path",
     "orphans",
     "widows",
     "-webkit-user-modify",
diff --git a/components/style/properties/longhands/svg.mako.rs b/components/style/properties/longhands/svg.mako.rs
index 13704e5953b..cb8764a3faf 100644
--- a/components/style/properties/longhands/svg.mako.rs
+++ b/components/style/properties/longhands/svg.mako.rs
@@ -80,6 +80,7 @@ ${helpers.predefined_type(
     "basic_shape::ClipPath",
     "generics::basic_shape::ClipPath::None",
     engines="gecko",
+    extra_prefixes="webkit",
     animation_value_type="basic_shape::ClipPath",
     spec="https://drafts.fxtf.org/css-masking/#propdef-clip-path",
 )}