diff --git a/uisimulator/x11/Makefile b/uisimulator/x11/Makefile
index f00835960c..027b804d6b 100644
--- a/uisimulator/x11/Makefile
+++ b/uisimulator/x11/Makefile
@@ -46,6 +46,7 @@ ifeq ($(UNAME),Linux)
   INCLUDES += -I/usr/X11R6/include
   LIBDIRS = -L/usr/X11R6/lib
   DEFINES += -DLINUX
+  MPEG_PLAY = 1
 else
   LIBDIRS = 
 endif