diff --git a/Makefile.in b/Makefile.in
index 23056f78..76a73b76 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -100,7 +100,6 @@ C_SRCS := $(srcroot)src/jemalloc.c \
 	$(srcroot)src/extent_mmap.c \
 	$(srcroot)src/hash.c \
 	$(srcroot)src/large.c \
-	$(srcroot)src/mb.c \
 	$(srcroot)src/mutex.c \
 	$(srcroot)src/nstime.c \
 	$(srcroot)src/pages.c \
diff --git a/include/jemalloc/internal/private_symbols.txt b/include/jemalloc/internal/private_symbols.txt
index 15d0449c..be56e1a2 100644
--- a/include/jemalloc/internal/private_symbols.txt
+++ b/include/jemalloc/internal/private_symbols.txt
@@ -296,7 +296,6 @@ malloc_tsd_no_cleanup
 malloc_vcprintf
 malloc_vsnprintf
 malloc_write
-mb_write
 narenas_auto
 narenas_total_get
 ncpus
diff --git a/src/mb.c b/src/mb.c
deleted file mode 100644
index 94f3c724..00000000
--- a/src/mb.c
+++ /dev/null
@@ -1,2 +0,0 @@
-#define JEMALLOC_MB_C_
-#include "jemalloc/internal/jemalloc_internal.h"