diff --git a/kernel/include/kernel/Lock/Mutex.h b/kernel/include/kernel/Lock/Mutex.h
index a4c895a2..a19b60f6 100644
--- a/kernel/include/kernel/Lock/Mutex.h
+++ b/kernel/include/kernel/Lock/Mutex.h
@@ -43,6 +43,7 @@ namespace Kernel
 				ASSERT(m_lock_depth == 0);
 			}
 			m_lock_depth++;
+			return true;
 		}
 
 		void unlock()