diff --git a/engine/common/mod_bmodel.c b/engine/common/mod_bmodel.c
index 0413ff1c..230f6a06 100644
--- a/engine/common/mod_bmodel.c
+++ b/engine/common/mod_bmodel.c
@@ -482,7 +482,7 @@ static int Mod_LoadTextureFromWadList( wadlist_t *list, const char *name, rgbdat
 	return -1;
 }
 
-static fs_offset_t Mod_CalculateMipTexSize( mip_t *mt, qboolean palette )
+static fs_offset_t Mod_CalculateMipTexSize( const mip_t *mt, qboolean palette )
 {
 	if( !mt )
 		return 0;