diff --git a/scripts/target/mame/mame.lua b/scripts/target/mame/mame.lua
index 3368cfb7b87..eff4648cbc7 100644
--- a/scripts/target/mame/mame.lua
+++ b/scripts/target/mame/mame.lua
@@ -1134,6 +1134,7 @@ FORMATS["FM7_CAS"] = true
 FORMATS["FMSX_CAS"] = true
 FORMATS["FMTOWNS_DSK"] = true
 FORMATS["FSD_DSK"] = true
+FORMATS["FS_CBMDOS"] = true
 FORMATS["FS_COCO_OS9"] = true
 FORMATS["FS_COCO_RSDOS"] = true
 FORMATS["FS_ORIC_JASMIN"] = true