diff --git a/internal/evaluator/builder.go b/internal/evaluator/builder.go
index a465504..488bdf8 100644
--- a/internal/evaluator/builder.go
+++ b/internal/evaluator/builder.go
@@ -268,7 +268,7 @@ func (bldr *Builder) processFieldExpressions(
 	var opts []cel.EnvOption
 	if fieldDesc.Kind() == protoreflect.MessageKind {
 		opts = []cel.EnvOption{
-			cel.TypeDescs(fieldDesc.ParentFile()),
+			cel.TypeDescs(fieldDesc.Message().ParentFile()),
 			cel.Variable("this", cel.ObjectType(string(fieldDesc.Message().FullName()))),
 		}
 	} else {
diff --git a/proto/tests/example/v1/validations.proto b/proto/tests/example/v1/validations.proto
index 3a5af1d..e45b156 100644
--- a/proto/tests/example/v1/validations.proto
+++ b/proto/tests/example/v1/validations.proto
@@ -130,4 +130,4 @@ message TransitiveFieldConstraint {
     message: "mask.paths must not be empty",
     expression: "has(this.paths)",
   }];
-}
\ No newline at end of file
+}