diff --git a/sway/desktop/transaction.c b/sway/desktop/transaction.c
index 17e3f467b..7975366e6 100644
--- a/sway/desktop/transaction.c
+++ b/sway/desktop/transaction.c
@@ -1,4 +1,5 @@
 #define _POSIX_C_SOURCE 200809L
+#include <errno.h>
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/sway/input/seat.c b/sway/input/seat.c
index ce2e0936e..b783a84f9 100644
--- a/sway/input/seat.c
+++ b/sway/input/seat.c
@@ -1,6 +1,7 @@
 #define _XOPEN_SOURCE 700
 #define _POSIX_C_SOURCE 199309L
 #include <assert.h>
+#include <errno.h>
 #ifdef __linux__
 #include <linux/input-event-codes.h>
 #elif __FreeBSD__