diff --git a/src/libostree/ostree-repo.c b/src/libostree/ostree-repo.c
index bd891976..b9697c76 100644
--- a/src/libostree/ostree-repo.c
+++ b/src/libostree/ostree-repo.c
@@ -20,8 +20,6 @@
  * Author: Colin Walters <walters@verbum.org>
  */
 
-#define _GNU_SOURCE
-
 #include "config.h"
 
 #include "ostree-repo-private.h"