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-rw-r--r--lens_default.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lens_default.c b/lens_default.c
index fb66b9d..a111bbc 100644
--- a/lens_default.c
+++ b/lens_default.c
@@ -21,7 +21,7 @@
* 02110-1301 USA
*/
-#define _XOPEN_SOURCE /* For wcwidth from wchar.h. */
+#define _GNU_SOURCE
#include <ctype.h>
#include <stdlib.h>