1 files changed, 1 insertions, 1 deletions

diff --git a/sway/container.c b/sway/container.c
index 9b1eac60..d43ee35e 100644
--- a/sway/container.c
+++ b/sway/container.c
@@ -1,3 +1,4 @@
+#define _XOPEN_SOURCE 500
 #include <ctype.h>
 #include <stdlib.h>
 #include <stdbool.h>
@@ -18,7 +19,6 @@
 #define ASSERT_NONNULL(PTR) \
         sway_assert (PTR, #PTR "must be non-null")
 
-
 static swayc_t *new_swayc(enum swayc_types type) {
         // next id starts at 1 because 0 is assigned to root_container in layout.c
         static size_t next_id = 1;