diff --git a/src/common/tvgLock.h b/src/common/tvgLock.h
index ea78e046..5dd3d5a6 100644
--- a/src/common/tvgLock.h
+++ b/src/common/tvgLock.h
@@ -38,10 +38,10 @@ namespace tvg {
     {
         Key* key = nullptr;
 
-        ScopedLock(Key& key)
+        ScopedLock(Key& k)
         {
-            key.mtx.lock();
-            this->key = &key;
+            k.mtx.lock();
+            key = &k;
         }
 
         ~ScopedLock()
@@ -67,4 +67,5 @@ namespace tvg {
 
 #endif //THORVG_THREAD_SUPPORT
 
-#endif //_TVG_LOCK_H_
\ No newline at end of file
+#endif //_TVG_LOCK_H_
+