diff --git a/src/window_new_campaign.c b/src/window_new_campaign.c
index d52e9482d5..19f25f6595 100644
--- a/src/window_new_campaign.c
+++ b/src/window_new_campaign.c
@@ -28,7 +28,7 @@
 #include "window.h"
 #include "window_dropdown.h"
 
-#define SELECTED_RIDE_UNDEFINED ((sint16)0xFFFF)
+#define SELECTED_RIDE_UNDEFINED ((uint16)0xFFFF)
 
 enum WINDOW_NEW_CAMPAIGN_WIDGET_IDX {
 	WIDX_BACKGROUND,