diff --git a/betterproto/casing.py b/betterproto/casing.py
index 543df68..c8dc2e2 100644
--- a/betterproto/casing.py
+++ b/betterproto/casing.py
@@ -20,6 +20,8 @@ def safe_snake_case(value: str) -> str:
         "and",
         "as",
         "assert",
+        "async",
+        "await",
         "break",
         "class",
         "continue",