diff --git a/test/unittest/readertest.cpp b/test/unittest/readertest.cpp
index d7c8edb..b42d832 100644
--- a/test/unittest/readertest.cpp
+++ b/test/unittest/readertest.cpp
@@ -849,7 +849,7 @@ struct IterativeParsingReaderHandler {
 
     bool StartObject() { RAPIDJSON_ASSERT(LogCount < LogCapacity); Logs[LogCount++] = LOG_STARTOBJECT; return true; }
 
-    bool Key (const Ch* str, SizeType len, bool copy) { RAPIDJSON_ASSERT(LogCount < LogCapacity); Logs[LogCount++] = LOG_KEY; return true; }
+    bool Key (const Ch*, SizeType, bool) { RAPIDJSON_ASSERT(LogCount < LogCapacity); Logs[LogCount++] = LOG_KEY; return true; }
 	
     bool EndObject(SizeType c) {
         RAPIDJSON_ASSERT(LogCount < LogCapacity);