diff --git a/src/mame/mess.flt b/src/mame/mess.flt
index e46bd83d48c..5e3ebaf5f0d 100644
--- a/src/mame/mess.flt
+++ b/src/mame/mess.flt
@@ -449,6 +449,7 @@ mod8.cpp
 modellot.cpp
 modena.cpp
 molecular.cpp
+monon_color.cpp
 monty.cpp
 mpc3000.cpp
 mpf1.cpp