diff --git a/src/nspawn/nspawn-stub-pid1.c b/src/nspawn/nspawn-stub-pid1.c
index 7f2f8f1f13..bb87eb1b62 100644
--- a/src/nspawn/nspawn-stub-pid1.c
+++ b/src/nspawn/nspawn-stub-pid1.c
@@ -25,6 +25,7 @@
 
 #include "fd-util.h"
 #include "log.h"
+#include "missing.h"
 #include "nspawn-stub-pid1.h"
 #include "process-util.h"
 #include "signal-util.h"