diff --git a/src/main_gui.cpp b/src/main_gui.cpp
--- a/src/main_gui.cpp
+++ b/src/main_gui.cpp
@@ -309,7 +309,7 @@ struct MainWindow : Window
 			case GHK_REFRESH_SCREEN: MarkWholeScreenDirty(); break;
 
 			case GHK_CRASH: // Crash the game
-				*(volatile byte *)0 = 0;
+				*(volatile byte *)nullptr = 0;
 				break;
 
 			case GHK_MONEY: // Gimme money