diff --git a/src/openvpn/init.c b/src/openvpn/init.c
index 1a601545..f0ae0b7f 100644
--- a/src/openvpn/init.c
+++ b/src/openvpn/init.c
@@ -3101,7 +3101,7 @@ do_init_frame(struct context *c)
      */
     if (c->options.ce.tun_mtu_extra_defined)
     {
-        tun_adjust_frame_parameters(&c->c2.frame, c->options.ce.tun_mtu_extra);
+        frame_add_to_extra_tun(&c->c2.frame, c->options.ce.tun_mtu_extra);
     }
 
     /*
diff --git a/src/openvpn/tun.h b/src/openvpn/tun.h
index 902665cc..7e8fb764 100644
--- a/src/openvpn/tun.h
+++ b/src/openvpn/tun.h
@@ -315,16 +315,6 @@ void check_subnet_conflict(const in_addr_t ip,
 
 void warn_on_use_of_common_subnets(openvpn_net_ctx_t *ctx);
 
-/*
- * Inline functions
- */
-
-static inline void
-tun_adjust_frame_parameters(struct frame *frame, int size)
-{
-    frame_add_to_extra_tun(frame, size);
-}
-
 /*
  * Should ifconfig be called before or after
  * tun dev open?