diff --git a/scripts/target/mame/arcade.lua b/scripts/target/mame/arcade.lua
index 98d86d70a89..dfb89307d92 100644
--- a/scripts/target/mame/arcade.lua
+++ b/scripts/target/mame/arcade.lua
@@ -823,6 +823,7 @@ BUSES["ZORRO"] = true
 -- specify used file formats
 --------------------------------------------------
 
+FORMATS["APOLLO_DSK"] = true
 FORMATS["GUAB_DSK"] = true
 FORMATS["AMI_DSK"] = true
 FORMATS["SC3000_BIT"] = true