diff --git a/components/style/properties/properties.mako.rs b/components/style/properties/properties.mako.rs
index fd2bc2cb373..e4f0ecc848e 100644
--- a/components/style/properties/properties.mako.rs
+++ b/components/style/properties/properties.mako.rs
@@ -474,9 +474,10 @@ impl NonCustomPropertyId {
         self.0
     }
 
+    /// Convert a `NonCustomPropertyId` into a `nsCSSPropertyID`.
     #[cfg(feature = "gecko")]
     #[inline]
-    fn to_nscsspropertyid(self) -> nsCSSPropertyID {
+    pub fn to_nscsspropertyid(self) -> nsCSSPropertyID {
         // unsafe: guaranteed by static_assert_nscsspropertyid above.
         unsafe { std::mem::transmute(self.0 as i32) }
     }