diff --git a/include/jemalloc/internal/jemalloc_internal.h.in b/include/jemalloc/internal/jemalloc_internal.h.in
index 6395d750..a558012a 100644
--- a/include/jemalloc/internal/jemalloc_internal.h.in
+++ b/include/jemalloc/internal/jemalloc_internal.h.in
@@ -376,7 +376,6 @@ typedef unsigned szind_t;
 #include "jemalloc/internal/witness.h"
 #include "jemalloc/internal/mutex.h"
 #include "jemalloc/internal/tsd.h"
-#include "jemalloc/internal/mb.h"
 #include "jemalloc/internal/extent.h"
 #include "jemalloc/internal/base.h"
 #include "jemalloc/internal/arena.h"
@@ -405,7 +404,6 @@ typedef unsigned szind_t;
 #include "jemalloc/internal/ctl.h"
 #include "jemalloc/internal/witness.h"
 #include "jemalloc/internal/mutex.h"
-#include "jemalloc/internal/mb.h"
 #include "jemalloc/internal/bitmap.h"
 #define	JEMALLOC_ARENA_STRUCTS_A
 #include "jemalloc/internal/arena.h"
@@ -497,7 +495,6 @@ void	jemalloc_postfork_child(void);
 #include "jemalloc/internal/ctl.h"
 #include "jemalloc/internal/witness.h"
 #include "jemalloc/internal/mutex.h"
-#include "jemalloc/internal/mb.h"
 #include "jemalloc/internal/bitmap.h"
 #include "jemalloc/internal/extent.h"
 #include "jemalloc/internal/base.h"
@@ -528,7 +525,6 @@ void	jemalloc_postfork_child(void);
 #include "jemalloc/internal/tsd.h"
 #include "jemalloc/internal/witness.h"
 #include "jemalloc/internal/mutex.h"
-#include "jemalloc/internal/mb.h"
 #include "jemalloc/internal/rtree.h"
 #include "jemalloc/internal/extent.h"
 #include "jemalloc/internal/base.h"
diff --git a/include/jemalloc/internal/mb.h b/include/jemalloc/internal/mb.h
deleted file mode 100644
index e58da5c3..00000000
--- a/include/jemalloc/internal/mb.h
+++ /dev/null
@@ -1,115 +0,0 @@
-/******************************************************************************/
-#ifdef JEMALLOC_H_TYPES
-
-#endif /* JEMALLOC_H_TYPES */
-/******************************************************************************/
-#ifdef JEMALLOC_H_STRUCTS
-
-#endif /* JEMALLOC_H_STRUCTS */
-/******************************************************************************/
-#ifdef JEMALLOC_H_EXTERNS
-
-#endif /* JEMALLOC_H_EXTERNS */
-/******************************************************************************/
-#ifdef JEMALLOC_H_INLINES
-
-#ifndef JEMALLOC_ENABLE_INLINE
-void	mb_write(void);
-#endif
-
-#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_MB_C_))
-#ifdef __i386__
-/*
- * According to the Intel Architecture Software Developer's Manual, current
- * processors execute instructions in order from the perspective of other
- * processors in a multiprocessor system, but 1) Intel reserves the right to
- * change that, and 2) the compiler's optimizer could re-order instructions if
- * there weren't some form of barrier.  Therefore, even if running on an
- * architecture that does not need memory barriers (everything through at least
- * i686), an "optimizer barrier" is necessary.
- */
-JEMALLOC_INLINE void
-mb_write(void)
-{
-
-#  if 0
-	/* This is a true memory barrier. */
-	asm volatile ("pusha;"
-	    "xor  %%eax,%%eax;"
-	    "cpuid;"
-	    "popa;"
-	    : /* Outputs. */
-	    : /* Inputs. */
-	    : "memory" /* Clobbers. */
-	    );
-#  else
-	/*
-	 * This is hopefully enough to keep the compiler from reordering
-	 * instructions around this one.
-	 */
-	asm volatile ("nop;"
-	    : /* Outputs. */
-	    : /* Inputs. */
-	    : "memory" /* Clobbers. */
-	    );
-#  endif
-}
-#elif (defined(__amd64__) || defined(__x86_64__))
-JEMALLOC_INLINE void
-mb_write(void)
-{
-
-	asm volatile ("sfence"
-	    : /* Outputs. */
-	    : /* Inputs. */
-	    : "memory" /* Clobbers. */
-	    );
-}
-#elif defined(__powerpc__)
-JEMALLOC_INLINE void
-mb_write(void)
-{
-
-	asm volatile ("eieio"
-	    : /* Outputs. */
-	    : /* Inputs. */
-	    : "memory" /* Clobbers. */
-	    );
-}
-#elif defined(__sparc__) && defined(__arch64__)
-JEMALLOC_INLINE void
-mb_write(void)
-{
-
-	asm volatile ("membar #StoreStore"
-	    : /* Outputs. */
-	    : /* Inputs. */
-	    : "memory" /* Clobbers. */
-	    );
-}
-#elif defined(__tile__)
-JEMALLOC_INLINE void
-mb_write(void)
-{
-
-	__sync_synchronize();
-}
-#else
-/*
- * This is much slower than a simple memory barrier, but the semantics of mutex
- * unlock make this work.
- */
-JEMALLOC_INLINE void
-mb_write(void)
-{
-	malloc_mutex_t mtx;
-
-	malloc_mutex_init(&mtx, "mb", WITNESS_RANK_OMIT);
-	malloc_mutex_lock(TSDN_NULL, &mtx);
-	malloc_mutex_unlock(TSDN_NULL, &mtx);
-}
-#endif
-#endif
-
-#endif /* JEMALLOC_H_INLINES */
-/******************************************************************************/