1 files changed, 2 insertions, 0 deletions
diff --git a/vis.c b/vis.c
index 05bcb40..f0b9e11 100644
--- a/vis.c
+++ b/vis.c
@@ -14,6 +14,8 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 #define _POSIX_SOURCE
+/* Necessary for SIGWINCH on OpenBSD */
+#define _BSD_SOURCE
 #include <locale.h>
 #include <stdlib.h>
 #include <unistd.h>