diff --git a/sys/dev/drm/sis_ds.h b/sys/dev/drm/sis_ds.h
index c57e132d46ab..d5cdbc27800a 100644
--- a/sys/dev/drm/sis_ds.h
+++ b/sys/dev/drm/sis_ds.h
@@ -36,7 +36,7 @@
 
 #define SET_SIZE 5000
 
-typedef unsigned int ITEM_TYPE;
+typedef unsigned long ITEM_TYPE;
 
 typedef struct {
 	ITEM_TYPE val;