diff --git a/libc/private/resolv_iface.h b/libc/private/resolv_iface.h
index bf5abad..789d997 100644
--- a/libc/private/resolv_iface.h
+++ b/libc/private/resolv_iface.h
@@ -48,7 +48,7 @@
 extern void _resolv_set_default_iface(const char* ifname);
 
 /* set name servers for an interface */
-extern void _resolv_set_nameservers_for_iface(const char* ifname, char** servers, int numservers,
+extern void _resolv_set_nameservers_for_iface(const char* ifname, const char** servers, int numservers,
         const char *domains);
 
 /* tell resolver of the address of an interface */