diff --git a/arch/um/os-Linux/skas/process.c b/arch/um/os-Linux/skas/process.c
index 92f7ee1..03b3c4c 100644
--- a/arch/um/os-Linux/skas/process.c
+++ b/arch/um/os-Linux/skas/process.c
@@ -21,6 +21,7 @@
 #include <registers.h>
 #include <skas.h>
 #include <sysdep/stub.h>
+#include <linux/threads.h>
 
 int is_skas_winch(int pid, int fd, void *data)
 {