1 files changed, 1 insertions, 0 deletions

diff --git a/arch/um/kernel/tt/gdb.c b/arch/um/kernel/tt/gdb.c
index 37e22d71a0d9..786e4edd86c5 100644
--- a/arch/um/kernel/tt/gdb.c
+++ b/arch/um/kernel/tt/gdb.c
@@ -20,6 +20,7 @@
 #include "user_util.h"
 #include "tt.h"
 #include "sysdep/thread.h"
+#include "os.h"
 
 extern int debugger_pid;
 extern int debugger_fd;