diff --git a/pywayland/scanner/entry.py b/pywayland/scanner/entry.py
index 0248880..b5aaee1 100644
--- a/pywayland/scanner/entry.py
+++ b/pywayland/scanner/entry.py
@@ -62,8 +62,8 @@ def output(self, enum_name: str, printer: Printer) -> None:
             int(self.name)
             printer("{}_{} = {}".format(enum_name, self.name, value))
         except ValueError:
-            if self.name == "name":
-                name = "name_"
+            if self.name in ("name", "async"):
+                name = self.name + "_"
             else:
                 name = self.name
             printer("{} = {}".format(name, value))