--- fat.c
+++ fat.c
@@ -704,7 +704,7 @@
if(check_media_type(This,boot, tot_sectors))
return -1;
- if(This->num_clus >= FAT12) {
+ if(This->num_clus >= FAT12 || config_fat_bits == 16) {
set_fat16(This);
/* third FAT byte must be 0xff */
if(!mtools_skip_check && readByte(This, 3) != 0xff)