diff --git a/tools/libinput-list-devices.c b/tools/libinput-list-devices.c
index 2869dd7a..e2023880 100644
--- a/tools/libinput-list-devices.c
+++ b/tools/libinput-list-devices.c
@@ -21,7 +21,8 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
-#define _GNU_SOURCE
+#include "config.h"
+
 #include <errno.h>
 #include <stdbool.h>
 #include <stdio.h>
diff --git a/tools/ptraccel-debug.c b/tools/ptraccel-debug.c
index aa887fec..a5b9a09b 100644
--- a/tools/ptraccel-debug.c
+++ b/tools/ptraccel-debug.c
@@ -20,7 +20,8 @@
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  * DEALINGS IN THE SOFTWARE.
  */
-#define _GNU_SOURCE
+
+#include "config.h"
 
 #include <assert.h>
 #include <errno.h>