diff --git a/examples/c/admin/logging.c b/examples/c/admin/logging.c
index 575d15a3a6..f7620b2ab5 100644
--- a/examples/c/admin/logging.c
+++ b/examples/c/admin/logging.c
@@ -1,3 +1,4 @@
+#define _GNU_SOURCE
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdbool.h>
diff --git a/examples/c/domain/domtop.c b/examples/c/domain/domtop.c
index 65663a1c39..2345a5953c 100644
--- a/examples/c/domain/domtop.c
+++ b/examples/c/domain/domtop.c
@@ -18,6 +18,7 @@
  * <http://www.gnu.org/licenses/>.
  */
 
+#define _GNU_SOURCE
 #include <errno.h>
 #include <getopt.h>
 #include <libvirt/libvirt.h>