diff --git a/ripngd/ripng_offset.c b/ripngd/ripng_offset.c
index 31d78ba..5bc2568 100644
--- a/ripngd/ripng_offset.c
+++ b/ripngd/ripng_offset.c
@@ -32,6 +32,8 @@
 #include "linklist.h"
 #include "memory.h"
 
+#include "ripngd/ripngd.h"
+
 #define RIPNG_OFFSET_LIST_IN  0
 #define RIPNG_OFFSET_LIST_OUT 1
 #define RIPNG_OFFSET_LIST_MAX 2
@@ -50,7 +52,7 @@
 
 static struct list *ripng_offset_list_master;
 
-int
+static int
 strcmp_safe (const char *s1, const char *s2)
 {
   if (s1 == NULL && s2 == NULL)
@@ -62,7 +64,7 @@
   return strcmp (s1, s2);
 }
 
-struct ripng_offset_list *
+static struct ripng_offset_list *
 ripng_offset_list_new ()
 {
   struct ripng_offset_list *new;
@@ -71,13 +73,13 @@
   return new;
 }
 
-void
+static void
 ripng_offset_list_free (struct ripng_offset_list *offset)
 {
   XFREE (MTYPE_RIPNG_OFFSET_LIST, offset);
 }
 
-struct ripng_offset_list *
+static struct ripng_offset_list *
 ripng_offset_list_lookup (const char *ifname)
 {
   struct ripng_offset_list *offset;
@@ -91,7 +93,7 @@
   return NULL;
 }
 
-struct ripng_offset_list *
+static struct ripng_offset_list *
 ripng_offset_list_get (const char *ifname)
 {
   struct ripng_offset_list *offset;
@@ -108,7 +110,7 @@
   return offset;
 }
 
-int
+static int
 ripng_offset_list_set (struct vty *vty, const char *alist,
 		       const char *direct_str, const char *metric_str,
 		       const char *ifname)
@@ -147,7 +149,7 @@
   return CMD_SUCCESS;
 }
 
-int
+static int
 ripng_offset_list_unset (struct vty *vty, const char *alist,
 			 const char *direct_str, const char *metric_str,
 			 const char *ifname)
@@ -338,13 +340,13 @@
   return ripng_offset_list_unset (vty, argv[0], argv[1], argv[2], argv[3]);
 }
 
-int
+static int
 offset_list_cmp (struct ripng_offset_list *o1, struct ripng_offset_list *o2)
 {
   return strcmp_safe (o1->ifname, o2->ifname);
 }
 
-void
+static void
 offset_list_del (struct ripng_offset_list *offset)
 {
   if (OFFSET_LIST_IN_NAME (offset))
@@ -357,7 +359,7 @@
 }
 
 void
-ripng_offset_init ()
+ripng_offset_init (void)
 {
   ripng_offset_list_master = list_new ();
   ripng_offset_list_master->cmp = (int (*)(void *, void *)) offset_list_cmp;
@@ -370,7 +372,7 @@
 }
 
 void
-ripng_offset_clean ()
+ripng_offset_clean (void)
 {
   list_delete (ripng_offset_list_master);