diff --git a/src/memory.c b/src/memory.c
index e0360bb..bd4e873 100644
--- a/src/memory.c
+++ b/src/memory.c
@@ -19,6 +19,9 @@
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  * IN THE SOFTWARE.
  */
+
+#define _GNU_SOURCE
+
 #include <assert.h>
 #include <errno.h>
 #include <fcntl.h>