diff --git a/src/objects/ufo.c b/src/objects/ufo.c
index 249e5b458..d335b86fa 100644
--- a/src/objects/ufo.c
+++ b/src/objects/ufo.c
@@ -1347,7 +1347,7 @@ static mobj_t *InitSpecialUFO(waypoint_t *start)
 
 	if (grandprixinfo.gp && grandprixinfo.specialDamage)
 	{
-		ufo->health -= min(4*mobjinfo[MT_SPECIAL_UFO].spawnhealth/10, grandprixinfo.specialDamage/6);
+		ufo->health -= min(4*(UINT32)mobjinfo[MT_SPECIAL_UFO].spawnhealth/10, grandprixinfo.specialDamage/6);
 	}
 
 	return ufo;