diff --git a/compiler/driver/compiler_driver.h b/compiler/driver/compiler_driver.h
index 3847c81..17b2f5e 100644
--- a/compiler/driver/compiler_driver.h
+++ b/compiler/driver/compiler_driver.h
@@ -122,8 +122,10 @@
       return true;
     }
     auto it1 = dex_file_oat_filename_map_->find(d1);
+    DCHECK(it1 != dex_file_oat_filename_map_->end());
     auto it2 = dex_file_oat_filename_map_->find(d2);
-    return it1 == it2;
+    DCHECK(it2 != dex_file_oat_filename_map_->end());
+    return it1->second == it2->second;
   }
 
   void CompileAll(jobject class_loader,