diff --git a/libdrm/xf86drm.c b/libdrm/xf86drm.c
index 3317ba5c..28f481ff 100644
--- a/libdrm/xf86drm.c
+++ b/libdrm/xf86drm.c
@@ -57,7 +57,7 @@
 
 #include "xf86drm.h"
 
-#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
+#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__DragonFly__)
 #define DRM_MAJOR 145
 #endif