diff --git a/ports/geckolib/glue.rs b/ports/geckolib/glue.rs
index 3a1af21f726..ad3e32f2458 100644
--- a/ports/geckolib/glue.rs
+++ b/ports/geckolib/glue.rs
@@ -18,6 +18,7 @@ use std::ptr;
 use style::applicable_declarations::ApplicableDeclarationBlock;
 use style::context::{CascadeInputs, QuirksMode, SharedStyleContext, StyleContext};
 use style::context::ThreadLocalStyleContext;
+use style::counter_style;
 use style::data::{ElementStyles, self};
 use style::dom::{ShowSubtreeData, TDocument, TElement, TNode};
 use style::driver;
@@ -4735,3 +4736,15 @@ pub unsafe extern "C" fn Servo_SourceSizeList_Evaluate(
 pub unsafe extern "C" fn Servo_SourceSizeList_Drop(list: RawServoSourceSizeListOwned) {
     let _ = list.into_box::<SourceSizeList>();
 }
+
+#[no_mangle]
+pub extern "C" fn Servo_ParseCounterStyleName(
+    value: *const nsACString,
+) -> *mut nsAtom {
+    let value = unsafe { value.as_ref().unwrap().as_str_unchecked() };
+    let mut input = ParserInput::new(&value);
+    match Parser::new(&mut input).parse_entirely(counter_style::parse_counter_style_name) {
+        Ok(name) => name.0.into_addrefed(),
+        Err(_) => ptr::null_mut(),
+    }
+}