diff --git a/include/linux/ppp-comp.h b/include/linux/ppp-comp.h
index e53ff65935dd..b7dc06f7f1d1 100644
--- a/include/linux/ppp-comp.h
+++ b/include/linux/ppp-comp.h
@@ -10,6 +10,8 @@
 #ifndef _NET_PPP_COMP_H
 #define _NET_PPP_COMP_H
 
+#ifdef __KERNEL__
+
 struct module;
 
 /*
@@ -98,6 +100,8 @@ struct compressor {
 #define DECOMP_ERROR		-1	/* error detected before decomp. */
 #define DECOMP_FATALERROR	-2	/* error detected after decomp. */
 
+#endif /* __KERNEL__ */
+
 /*
  * CCP codes.
  */