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diff --git a/contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h b/contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h
--- a/contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h
+++ b/contrib/jemalloc/include/jemalloc/jemalloc_FreeBSD.h
@@ -39,7 +39,11 @@
# define JEMALLOC_TLS_MODEL __attribute__((tls_model("initial-exec")))
#endif
#ifdef __amd64__
+#ifdef _USE_LG_VADDR_WIDE
+# define LG_VADDR 64
+#else
# define LG_VADDR 48
+#endif
# define LG_SIZEOF_PTR 3
# define JEMALLOC_TLS_MODEL __attribute__((tls_model("initial-exec")))
#endif
diff --git a/lib/libc/stdlib/malloc/jemalloc/Makefile.inc b/lib/libc/stdlib/malloc/jemalloc/Makefile.inc
--- a/lib/libc/stdlib/malloc/jemalloc/Makefile.inc
+++ b/lib/libc/stdlib/malloc/jemalloc/Makefile.inc
@@ -5,6 +5,9 @@
test_hooks.c ticker.c tsd.c witness.c
CFLAGS+=-I${SRCTOP}/contrib/jemalloc/include
+.if ${MK_JEMALLOC_LG_VADDR_WIDE} != no
+CFLAGS+=-D_USE_LG_VADDR_WIDE
+.endif
.for src in ${JEMALLOCSRCS}
MISRCS+=jemalloc_${src}
diff --git a/share/mk/src.opts.mk b/share/mk/src.opts.mk
--- a/share/mk/src.opts.mk
+++ b/share/mk/src.opts.mk
@@ -116,6 +116,7 @@
IPFW \
ISCSI \
JAIL \
+ JEMALLOC_LG_VADDR_WIDE \
KDUMP \
KVM \
LDNS \
diff --git a/tools/build/options/WITH_JEMALLOC_LG_VADDR_WIDE b/tools/build/options/WITH_JEMALLOC_LG_VADDR_WIDE
new file mode 100644
--- /dev/null
+++ b/tools/build/options/WITH_JEMALLOC_LG_VADDR_WIDE
@@ -0,0 +1,4 @@
+Allow programs to use more than 48 address bits on amd64.
+Required for LA57 mode.
+Disabling this option might result in a slight reduction in memory
+consumption for jemalloc metadata.

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