diff --git a/rtemsbsd/include/rtems/bsd/zerocopy.h b/rtemsbsd/include/rtems/bsd/zerocopy.h
index b15333c4..339e7a42 100644
--- a/rtemsbsd/include/rtems/bsd/zerocopy.h
+++ b/rtemsbsd/include/rtems/bsd/zerocopy.h
@@ -53,8 +53,7 @@ struct mbuf *rtems_bsd_m_get(int how, short type);
 struct mbuf *rtems_bsd_m_gethdr(int how, short type);
 
 void rtems_bsd_m_extaddref(struct mbuf *m, void *buf, size_t size,
-    u_int *ref_cnt, void (*freef)(void *, void *), void *arg1,
-    void *arg2);
+    u_int *ref_cnt, m_ext_free_t *freef, void *arg1, void *arg2);
 
 void rtems_bsd_m_free(struct mbuf *m);
 
diff --git a/rtemsbsd/rtems/rtems-kernel-mbuf.c b/rtemsbsd/rtems/rtems-kernel-mbuf.c
index a1429d86..1d10b51f 100644
--- a/rtemsbsd/rtems/rtems-kernel-mbuf.c
+++ b/rtemsbsd/rtems/rtems-kernel-mbuf.c
@@ -55,8 +55,7 @@ rtems_bsd_m_gethdr(int how, short type)
 
 void
 rtems_bsd_m_extaddref(struct mbuf *m, void *buf, size_t size,
-    u_int *ref_cnt, void (*freef)(void *, void *), void *arg1,
-    void *arg2)
+    u_int *ref_cnt, m_ext_free_t *freef, void *arg1, void *arg2)
 {
 	m_extaddref(m, buf, size, ref_cnt, freef, arg1, arg2);
 }
diff --git a/testsuite/zerocopy01/test_main.c b/testsuite/zerocopy01/test_main.c
index d23c746f..e528257f 100644
--- a/testsuite/zerocopy01/test_main.c
+++ b/testsuite/zerocopy01/test_main.c
@@ -82,10 +82,10 @@ struct buffer_control {
 static struct buffer_control buffer_control;
 
 static void
-buffer_free(void *arg1, void *arg2)
+buffer_free(struct mbuf *m)
 {
-	struct buffer_control *bc = arg1;
-	struct buffer *buf = arg2;
+	struct buffer_control *bc = m->m_ext.ext_arg1;
+	struct buffer *buf = m->m_ext.ext_arg2;
 	rtems_status_code sc;
 	rtems_interrupt_lock_context lock_context;
 	rtems_id waiting_task;