diff --git a/components/style/properties/gecko.mako.rs b/components/style/properties/gecko.mako.rs
index de2359193dc..16efa82aa17 100644
--- a/components/style/properties/gecko.mako.rs
+++ b/components/style/properties/gecko.mako.rs
@@ -4142,6 +4142,23 @@ fn static_assert() {
         self.copy_list_style_type_from(other)
     }
 
+    pub fn clone_list_style_type(&self) -> longhands::list_style_type::computed_value::T {
+        use gecko_bindings::bindings::Gecko_CounterStyle_IsSingleString;
+        use gecko_bindings::bindings::Gecko_CounterStyle_GetSingleString;
+        use self::longhands::list_style_type::computed_value::T;
+        use values::generics::CounterStyleOrNone;
+
+        if unsafe { Gecko_CounterStyle_IsSingleString(&self.gecko.mCounterStyle) } {
+            ns_auto_string!(single_string);
+            unsafe {
+                Gecko_CounterStyle_GetSingleString(&self.gecko.mCounterStyle, &mut *single_string)
+            };
+            T::String(single_string.to_string())
+        } else {
+            T::CounterStyle(CounterStyleOrNone::from_gecko_value(&self.gecko.mCounterStyle))
+        }
+    }
+
     pub fn set_quotes(&mut self, other: longhands::quotes::computed_value::T) {
         use gecko_bindings::bindings::Gecko_NewStyleQuoteValues;
         use gecko_bindings::sugar::refptr::UniqueRefPtr;
diff --git a/components/style/properties/longhand/list.mako.rs b/components/style/properties/longhand/list.mako.rs
index b993824ad4e..3780fa0c400 100644
--- a/components/style/properties/longhand/list.mako.rs
+++ b/components/style/properties/longhand/list.mako.rs
@@ -27,8 +27,7 @@ ${helpers.single_keyword("list-style-position", "outside inside", animation_valu
         arabic-indic bengali cambodian cjk-decimal devanagari gujarati gurmukhi kannada khmer lao
         malayalam mongolian myanmar oriya persian telugu thai tibetan cjk-earthly-branch
         cjk-heavenly-stem lower-greek hiragana hiragana-iroha katakana katakana-iroha""",
-        needs_conversion="True",
-        animation_value_type="none",
+        animation_value_type="discrete",
         spec="https://drafts.csswg.org/css-lists/#propdef-list-style-type")}
 % else:
     <%helpers:longhand name="list-style-type" animation_value_type="none" boxed="True"