1 files changed, 1 insertions, 0 deletions

diff --git a/arch/um/kernel/tt/mem_user.c b/arch/um/kernel/tt/mem_user.c
index 3085267459b1..03e589895388 100644
--- a/arch/um/kernel/tt/mem_user.c
+++ b/arch/um/kernel/tt/mem_user.c
@@ -12,6 +12,7 @@
 #include "tt.h"
 #include "mem_user.h"
 #include "user_util.h"
+#include "os.h"
 
 void remap_data(void *segment_start, void *segment_end, int w)
 {