diff --git a/babeld/babel_interface.c b/babeld/babel_interface.c
index ff9c5eb..4bd4499 100644
--- a/babeld/babel_interface.c
+++ b/babeld/babel_interface.c
@@ -61,7 +61,7 @@
 static int babel_if_new_hook    (struct interface *ifp);
 static int babel_if_delete_hook (struct interface *ifp);
 static int interface_config_write (struct vty *vty);
-static babel_interface_nfo * babel_interface_allocate ();
+static babel_interface_nfo * babel_interface_allocate (void);
 static void babel_interface_free (babel_interface_nfo *bi);
 
 
@@ -738,7 +738,7 @@
 /* functions to allocate or free memory for a babel_interface_nfo, filling
  needed fields */
 static babel_interface_nfo *
-babel_interface_allocate ()
+babel_interface_allocate (void)
 {
     babel_interface_nfo *babel_ifp;
     babel_ifp = XMALLOC(MTYPE_BABEL_IF, sizeof(babel_interface_nfo));