diff --git a/ports/geckolib/binding_tools/regen.py b/ports/geckolib/binding_tools/regen.py
index 679011a3b3a..836b1dcc641 100755
--- a/ports/geckolib/binding_tools/regen.py
+++ b/ports/geckolib/binding_tools/regen.py
@@ -141,6 +141,7 @@ COMPILATION_TARGETS = {
             "StyleBasicShape", "nsCSSShadowArray",
         ],
         "opaque_types": [
+            "atomic___base",
             "nsAString_internal_char_traits",
             "nsAString_internal_incompatible_char_type",
             "nsACString_internal_char_traits",