diff --git a/src/ifconfig.c b/src/ifconfig.c
index 25ab075..e40418b 100644
--- a/src/ifconfig.c
+++ b/src/ifconfig.c
@@ -43,7 +43,7 @@ extern size_t strlcpy(char *dst, const char *src, size_t siz);
  * Returns:
  * POSIX OK(0) on success, or non-zero on error.
  */
-int ifconfig(char *ifname, char *addr, char *mask, int up)
+int ifconfig(const char *ifname, const char *addr, const char *mask, int up)
 {
 	int sd, ret = -1;
 	struct ifreq ifr;
diff --git a/src/lite.h b/src/lite.h
index 3b36fb5..e7e1e11 100644
--- a/src/lite.h
+++ b/src/lite.h
@@ -65,7 +65,7 @@ int     movefile   (char *src, char *dst);
 int     fcopyfile  (FILE *src, FILE *dst);
 ssize_t fsendfile  (FILE *src, FILE *dst, size_t len);
 
-int     ifconfig   (char *ifname, char *addr, char *mask, int up);
+int     ifconfig   (const char *ifname, const char *addr, const char *mask, int up);
 
 lfile_t*lfopen     (const char *file, const char *sep);
 void    lfclose    (lfile_t *lf);