diff --git a/sys/dev/e1000/e1000_osdep.h b/sys/dev/e1000/e1000_osdep.h
index 5e19ebb0aeee..82a8a6514ce3 100644
--- a/sys/dev/e1000/e1000_osdep.h
+++ b/sys/dev/e1000/e1000_osdep.h
@@ -131,18 +131,6 @@ typedef int8_t		s8;
 #define __le32		u32
 #define __le64		u64
 
-#if __FreeBSD_version < 800000
-#if defined(__i386__) || defined(__amd64__)
-#define mb()	__asm volatile("mfence" ::: "memory")
-#define wmb()	__asm volatile("sfence" ::: "memory")
-#define rmb()	__asm volatile("lfence" ::: "memory")
-#else
-#define mb()
-#define rmb()
-#define wmb()
-#endif
-#endif /*__FreeBSD_version < 800000 */
-
 #ifdef INVARIANTS
 #define ASSERT_CTX_LOCK_HELD(hw) (sx_assert(iflib_ctx_lock_get(((struct e1000_osdep *)hw->back)->ctx), SX_XLOCKED))
 #else