diff --git a/src/mame/arcade.flt b/src/mame/arcade.flt
index fa41cd3bd53..0a21b588425 100644
--- a/src/mame/arcade.flt
+++ b/src/mame/arcade.flt
@@ -1254,6 +1254,7 @@ undrfire.cpp
 unico.cpp
 unkhorse.cpp
 upscope.cpp
+usbilliards.cpp
 usgames.cpp
 vamphalf.cpp
 vaportra.cpp