diff --git a/src/basic/user-util.c b/src/basic/user-util.c
index 19155bce53..f65ca3edaa 100644
--- a/src/basic/user-util.c
+++ b/src/basic/user-util.c
@@ -30,6 +30,7 @@
 #include <sys/stat.h>
 #include <unistd.h>
 
+#include "missing.h"
 #include "alloc-util.h"
 #include "fd-util.h"
 #include "formats-util.h"