diff --git a/xserver/hw/xfree86/xf1bpp/Makefile.am b/xserver/hw/xfree86/xf1bpp/Makefile.am
index e7c873ae8..762e7d42f 100644
--- a/xserver/hw/xfree86/xf1bpp/Makefile.am
+++ b/xserver/hw/xfree86/xf1bpp/Makefile.am
@@ -60,7 +60,7 @@ libxf1bppmfb_a_SOURCES = \
 
 libxf1bpp_la_SOURCES = $(libxf1bppmfb_a_SOURCES) $(libxf1bppgen_a_SOURCES)
 
-AM_CFLAGS = -DXF86MONO -include mfbmap.h $(DIX_CFLAGS) $(XORG_CFLAGS)
+AM_CFLAGS = -DXF86MONO -include ${srcdir}/mfbmap.h $(DIX_CFLAGS) $(XORG_CFLAGS)
 INCLUDES = $(XORG_INCS) -I$(top_srcdir)/mfb
 
 mfbseg.c: