diff --git a/tools/simulator/libsimulator/lib/runtime/Widget_mac.h b/tools/simulator/libsimulator/lib/runtime/Widget_mac.h
index 79bd4e7542..484d7c5b24 100644
--- a/tools/simulator/libsimulator/lib/runtime/Widget_mac.h
+++ b/tools/simulator/libsimulator/lib/runtime/Widget_mac.h
@@ -4,9 +4,8 @@
 //
 //
 
-#ifndef libsimulator_studio_Widget_mac_h
-#define libsimulator_studio_Widget_mac_h
+#pragma once
 
-std::string getCurAppName(void);
+std::string getCurAppName();
 
 #endif