diff --git a/xf86drm.h b/xf86drm.h
index 7b85079a..d435579c 100644
--- a/xf86drm.h
+++ b/xf86drm.h
@@ -66,6 +66,13 @@ extern "C" {
 #define DRM_IOC_READWRITE       IOC_INOUT
 #define DRM_IOC(dir, group, nr, size) _IOC(dir, group, nr, size)
 
+#endif
+
+#if defined(__HAIKU__) && !defined(makedev)
+/* Haiku has the POSIX dev_t type, no makedev macro though */
+#define makedev(major,minor) (((major) << 8) | ((minor) & 0xff))
+#define major(dev) ((int)(((dev) >> 8) & 0xff))
+#define minor(dev) ((int)((dev) & 0xff))
 #endif
 
 				/* Defaults, if nothing set in xf86config */