diff --git a/daemon/dbus_messaging.c b/daemon/dbus_messaging.c
index 5c48aa0..96d8f80 100644
--- a/daemon/dbus_messaging.c
+++ b/daemon/dbus_messaging.c
@@ -29,6 +29,8 @@ POSSIBILITY OF SUCH DAMAGE.
 
  */
 
+#define _GNU_SOURCE
+
 #include "dbus_messaging.h"
 #include "daemonize.h"
 #include "gamemode.h"
diff --git a/lib/client_impl.c b/lib/client_impl.c
index 2b76c84..822fb26 100644
--- a/lib/client_impl.c
+++ b/lib/client_impl.c
@@ -28,6 +28,9 @@ ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 POSSIBILITY OF SUCH DAMAGE.
 
  */
+
+#define _GNU_SOURCE
+
 #include <dlfcn.h>
 #include <errno.h>
 #include <stdio.h>