diff --git a/test-app/runtime/src/main/cpp/MetadataNode.cpp b/test-app/runtime/src/main/cpp/MetadataNode.cpp
index 5096abffd..37aa46e5a 100644
--- a/test-app/runtime/src/main/cpp/MetadataNode.cpp
+++ b/test-app/runtime/src/main/cpp/MetadataNode.cpp
@@ -1984,7 +1984,7 @@ void MetadataNode::EnableProfiler(bool enableProfiler) {
     s_profilerEnabled = enableProfiler;
 }
 
-bool MetadataNode::IsJavascriptKeyword(std::string word) {
+bool MetadataNode::IsJavascriptKeyword(const std::string &word) {
     static set<string> keywords;
 
     if (keywords.empty()) {
diff --git a/test-app/runtime/src/main/cpp/MetadataNode.h b/test-app/runtime/src/main/cpp/MetadataNode.h
index a5aa9b7c1..71e7bfc05 100644
--- a/test-app/runtime/src/main/cpp/MetadataNode.h
+++ b/test-app/runtime/src/main/cpp/MetadataNode.h
@@ -76,7 +76,7 @@ class MetadataNode {
 
         MetadataNode(MetadataTreeNode* treeNode);
 
-        static bool IsJavascriptKeyword(std::string word);
+        static bool IsJavascriptKeyword(const std::string &word);
         v8::Local<v8::Object> CreatePackageObject(v8::Isolate* isolate);
 
         v8::Local<v8::Function> GetConstructorFunction(v8::Isolate* isolate);