diff --git a/hw/xfree86/os-support/bsd/Makefile.am b/hw/xfree86/os-support/bsd/Makefile.am
index 5d83d6f06..d65b3852d 100644
--- a/hw/xfree86/os-support/bsd/Makefile.am
+++ b/hw/xfree86/os-support/bsd/Makefile.am
@@ -49,7 +49,7 @@ ARCH_SOURCES = \
 endif
 
 # FIXME: NetBSD Aperture defines (configure.ac)
-AM_CFLAGS = -DUSESTDRES -DUSE_DEV_IO $(XORG_CFLAGS) @SERVER_DEFINES@ @LOADER_DEFINES@
+AM_CFLAGS = -DUSESTDRES $(XORG_CFLAGS) @SERVER_DEFINES@ @LOADER_DEFINES@
 
 INCLUDES = $(XORG_INCS)