diff --git a/runtime/openjdkjvmti/transform.h b/runtime/openjdkjvmti/transform.h
index 85bcb00..a76ed93 100644
--- a/runtime/openjdkjvmti/transform.h
+++ b/runtime/openjdkjvmti/transform.h
@@ -54,7 +54,7 @@
 
 // Install the new dex file.
 jvmtiError MoveTransformedFileIntoRuntime(jclass jklass,
-                                          std::string original_location,
+                                          const std::string& original_location,
                                           jint data_len,
                                           unsigned char* dex_data);