diff --git a/drivers/misc/c2port/core.c b/drivers/misc/c2port/core.c
index 976b35d1d035350beaf8b8d5a36aa30e6a3882e1..0207dd59090d195b4d0d21027e511cf484e14121 100644
--- a/drivers/misc/c2port/core.c
+++ b/drivers/misc/c2port/core.c
@@ -18,6 +18,7 @@
 #include <linux/ctype.h>
 #include <linux/delay.h>
 #include <linux/idr.h>
+#include <linux/sched.h>
 
 #include <linux/c2port.h>