diff --git a/meson.build b/meson.build
index 841cb10..8fdd116 100644
--- a/meson.build
+++ b/meson.build
@@ -1,4 +1,4 @@
-project('qbootctl', 'c', default_options : ['c_std=c11'])
+project('qbootctl', 'c', default_options : ['c_std=gnu11'])
 
 cc = meson.get_compiler('c')
 
diff --git a/ufs-bsg.c b/ufs-bsg.c
index ef505d2..05c8885 100644
--- a/ufs-bsg.c
+++ b/ufs-bsg.c
@@ -27,7 +27,6 @@
  * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#define _DEFAULT_SOURCE
 #include <linux/bsg.h>
 #include <scsi/scsi_bsg_ufs.h>
 #include <endian.h>