diff --git a/uisimulator/x11/Makefile b/uisimulator/x11/Makefile
index d90295b405..e638dba15f 100644
--- a/uisimulator/x11/Makefile
+++ b/uisimulator/x11/Makefile
@@ -29,13 +29,13 @@ DEBUG = -g
 DEFINES = -DHAVE_CONFIG_H -DGETTIMEOFDAY_TWO_ARGS -DSIMULATOR -DHAVE_LCD_BITMAP  -DHAVE_RECORDER_KEYPAD
 LDFLAGS = -lX11 -lm -lXt -lXmu -lnsl
 
+INCLUDES = -I$(DRIVERS) -I$(FIRMWAREDIR)
 
 UNAME := $(shell uname)
 ifeq ($(UNAME),Linux)
-  INCLUDES = -I/usr/X11R6/include -I$(DRIVERS) -I$(FIRMWAREDIR)
+  INCLUDES = -I/usr/X11R6/include $(INCLUDES)
   LIBDIRS = -L/usr/X11R6/lib
 else
-  INCLUDES = -I$(FIRMWAREDIR) 
   LIBDIRS = 
 endif