diff --git a/userbenchmark/dynamo/dynamobench/_dynamo/utils.py b/userbenchmark/dynamo/dynamobench/_dynamo/utils.py
index a41d92724e..b66b17a98c 100644
--- a/userbenchmark/dynamo/dynamobench/_dynamo/utils.py
+++ b/userbenchmark/dynamo/dynamobench/_dynamo/utils.py
@@ -774,6 +774,7 @@ def proxy_args_kwargs(args, kwargs):
 
 @dataclasses.dataclass
 class CompilationMetrics:
+    is_forward: bool = dataclasses.field(default=True, init=False)
     compile_id: str
     frame_key: str
     co_name: str
@@ -814,6 +815,7 @@ class CompilationMetrics:
 
 @dataclasses.dataclass
 class BwdCompilationMetrics:
+    is_forward: bool = dataclasses.field(default=False, init=False)
     compile_id: str
     inductor_compile_time_s: Optional[float]
     code_gen_time_s: Optional[float]