diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2e575e51d..f9f75be9f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,8 @@
 * Remove overambitious assertions in the HTTP state machine,
   fix some error handling.
   ([#5383](https://github.com/mitmproxy/mitmproxy/issues/5383), @mhils)
+* Use default_factory for parser_options.
+  ([#5474](https://github.com/mitmproxy/mitmproxy/issues/5474), @rathann)
 
 ## 15 May 2022: mitmproxy 8.1.0
 
diff --git a/mitmproxy/contentviews/grpc.py b/mitmproxy/contentviews/grpc.py
index a5ef99708..5c73220c8 100644
--- a/mitmproxy/contentviews/grpc.py
+++ b/mitmproxy/contentviews/grpc.py
@@ -951,7 +951,7 @@ def format_grpc(
 
 @dataclass
 class ViewConfig:
-    parser_options: ProtoParser.ParserOptions = ProtoParser.ParserOptions()
+    parser_options: ProtoParser.ParserOptions = field(default_factory=ProtoParser.ParserOptions)
     parser_rules: list[ProtoParser.ParserRule] = field(default_factory=list)