diff --git a/src/mame/mess.flt b/src/mame/mess.flt
index e8954f57cd4..2d5cccdc8a3 100644
--- a/src/mame/mess.flt
+++ b/src/mame/mess.flt
@@ -1133,6 +1133,7 @@ xerox820.cpp
 xor100.cpp
 ymdx11.cpp
 ymmu100.cpp
+ymmu5.cpp
 ymmu50.cpp
 ymmu80.cpp
 ymtx81z.cpp