diff --git a/core/fpdfapi/parser/cpdf_object_stream.cpp b/core/fpdfapi/parser/cpdf_object_stream.cpp
index 19294da..16dc92c 100644
--- a/core/fpdfapi/parser/cpdf_object_stream.cpp
+++ b/core/fpdfapi/parser/cpdf_object_stream.cpp
@@ -21,8 +21,7 @@
 
 namespace {
 
-bool IsObjectStream(const CPDF_Object* object) {
-  const CPDF_Stream* stream = ToStream(object);
+bool IsObjectStream(const CPDF_Stream* stream) {
   if (!stream)
     return false;