diff --git a/src/sdl/iwadpicker_cocoa.mm b/src/sdl/iwadpicker_cocoa.mm
index 7a6b38623..92eb47e40 100644
--- a/src/sdl/iwadpicker_cocoa.mm
+++ b/src/sdl/iwadpicker_cocoa.mm
@@ -33,6 +33,9 @@
  **
  */
 
+// Avoid collision between DObject class and Objective-C
+#define Class ObjectClass
+
 #include "cmdlib.h"
 #include "d_main.h"
 #include "version.h"
@@ -40,6 +43,9 @@
 #include "m_argv.h"
 #include "m_misc.h"
 #include "gameconfigfile.h"
+
+#undef Class
+
 #include <Cocoa/Cocoa.h>
 #include <wordexp.h>