diff --git a/ui/drivers/cocoa/cocoa_common.h b/ui/drivers/cocoa/cocoa_common.h
index a7162cfb82..81be4afd20 100644
--- a/ui/drivers/cocoa/cocoa_common.h
+++ b/ui/drivers/cocoa/cocoa_common.h
@@ -176,4 +176,6 @@ extern apple_frontend_settings_t apple_frontend_settings;
 #define UNSAFE_UNRETAINED
 #endif
 
+void *get_chosen_screen(void);
+
 #endif