--- a/compat/compat-2.6.39.c
+++ b/compat/compat-2.6.39.c
@@ -10,6 +10,7 @@
 
 #include <linux/compat.h>
 #include <linux/tty.h>
+#include <linux/sched.h>
 
 /*
  *		Termios Helper Methods