diff --git a/components/style/binding_tools/regen_atoms.py b/components/style/binding_tools/regen_atoms.py
index eb6e9752d51..b14a30dd0e0 100755
--- a/components/style/binding_tools/regen_atoms.py
+++ b/components/style/binding_tools/regen_atoms.py
@@ -223,7 +223,7 @@ PSEUDO_ELEMENT_HEADER = """
  *
  * ```
  * fn have_to_use_pseudo_elements() {
- *     macro_rules pseudo_element! {
+ *     macro_rules! pseudo_element {
  *         ($pseudo_str_with_colon:expr, $pseudo_atom:expr, $is_anon_box:true) => {{
  *             // Stuff stuff stuff.
  *         }}
diff --git a/components/style/gecko/generated/gecko_pseudo_element_helper.rs b/components/style/gecko/generated/gecko_pseudo_element_helper.rs
index 987580028a2..e9d61b03bd8 100644
--- a/components/style/gecko/generated/gecko_pseudo_element_helper.rs
+++ b/components/style/gecko/generated/gecko_pseudo_element_helper.rs
@@ -17,7 +17,7 @@
  *
  * ```
  * fn have_to_use_pseudo_elements() {
- *     macro_rules pseudo_element! {
+ *     macro_rules! pseudo_element {
  *         ($pseudo_str_with_colon:expr, $pseudo_atom:expr, $is_anon_box:true) => {{
  *             // Stuff stuff stuff.
  *         }}