diff --git a/libi3/create_socket.c b/libi3/create_socket.c
index 8b756a38..d476f43a 100644
--- a/libi3/create_socket.c
+++ b/libi3/create_socket.c
@@ -10,6 +10,7 @@
 #include <unistd.h>
 #include <libgen.h>
 #include <err.h>
+#include <errno.h>
 #include <fcntl.h>
 #include <stdlib.h>
 #include <string.h>