diff --git a/[refs] b/[refs]
index f8749801bf06..a390e30bc48c 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3d5ede6f776bdb1483bcd086f79c3bf41fed3865
+refs/heads/master: b6d8adf477439e7086224bc9674c6b6638780783
diff --git a/trunk/arch/um/os-Linux/helper.c b/trunk/arch/um/os-Linux/helper.c
index 74ca7aabf4e1..30860b89ec58 100644
--- a/trunk/arch/um/os-Linux/helper.c
+++ b/trunk/arch/um/os-Linux/helper.c
@@ -7,6 +7,7 @@
 #include <unistd.h>
 #include <errno.h>
 #include <sched.h>
+#include <linux/limits.h>
 #include <sys/socket.h>
 #include <sys/wait.h>
 #include "kern_constants.h"