Index: sys/dev/e1000/e1000_osdep.h
===================================================================
--- sys/dev/e1000/e1000_osdep.h	(revision 225674)
+++ sys/dev/e1000/e1000_osdep.h	(working copy)
@@ -82,7 +82,7 @@
 /* Mutex used in the shared code */
 #define E1000_MUTEX                     struct mtx
 #define E1000_MUTEX_INIT(mutex)         mtx_init((mutex), #mutex, \
-                                            MTX_NETWORK_LOCK, MTX_DEF)
+                                            NULL, MTX_DEF)
 #define E1000_MUTEX_DESTROY(mutex)      mtx_destroy(mutex)
 #define E1000_MUTEX_LOCK(mutex)         mtx_lock(mutex)
 #define E1000_MUTEX_TRYLOCK(mutex)      mtx_trylock(mutex)