diff --git a/uisimulator/x11/Makefile b/uisimulator/x11/Makefile
index d3f36b4c92..215fe66a28 100644
--- a/uisimulator/x11/Makefile
+++ b/uisimulator/x11/Makefile
@@ -91,7 +91,7 @@ ifeq ($(DISPLAY),-DHAVE_LCD_BITMAP)
    APPS += tetris.c sokoban.c blank.c bounce.c boxes.c icons.c bmp.c widgets.c
 endif
 
-SRCS = screenhack.c uibasic.c resources.c visual.c lcd-x11.c \
+SRCS = screenhack.c uibasic.c resources.c visual.c lcd-x11.c stubs.c \
         button-x11.c io.c thread.c $(APPS) $(MENUS) $(FIRMSRCS)
 
 ifdef MPEG_PLAY
@@ -240,6 +240,9 @@ $(OBJDIR)/mpeg.o: $(FIRMWAREDIR)/mpeg.c
 $(OBJDIR)/sprintf.o: $(COMMON)/sprintf.c
 	$(CC) $(CFLAGS) -c $< -o $@
 
+$(OBJDIR)/stubs.o: ../common/stubs.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
 $(OBJDIR)/usb.o: $(FIRMWAREDIR)/usb.c
 	$(CC) $(CFLAGS) -c $< -o $@