diff --git a/xf86drm.c b/xf86drm.c
index 3d03cbff..a783a28e 100644
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -2822,6 +2822,8 @@ static char *drmGetMinorNameForFD(int fd, int type)
 
 out_close_dir:
 	closedir(sysdir);
+#else
+#warning "Missing implementation of drmGetMinorNameForFD"
 #endif
 	return NULL;
 }