diff --git a/cfg_file.y b/cfg_file.y
index a70fbf8..bf01e4d 100644
--- a/cfg_file.y
+++ b/cfg_file.y
@@ -610,7 +610,7 @@ int clear_nat_hack_client(void *d, void *u)
 }
 
 /* Clear the VTUN_NAT_HACK flag which are not relevant to the current operation mode */
-inline void clear_nat_hack_flags(int svr)
+void clear_nat_hack_flags(int svr)
 {
 	if (svr)
 		llist_trav(&host_list,clear_nat_hack_server,NULL);
diff --git a/vtun.h b/vtun.h
index eacd0c5..1ba7c9a 100644
--- a/vtun.h
+++ b/vtun.h
@@ -232,6 +232,6 @@ void client(struct vtun_host *host);
 int  tunnel(struct vtun_host *host);
 int  read_config(char *file);
 struct vtun_host * find_host(char *host);
-inline void clear_nat_hack_flags(int svr);
+void clear_nat_hack_flags(int svr);
 
 #endif