Index: share/mk/bsd.own.mk
===================================================================
--- share/mk/bsd.own.mk	(revision 239733)
+++ share/mk/bsd.own.mk	(working copy)
@@ -370,6 +370,7 @@
     LS_COLORS \
     MAIL \
     MAILWRAPPER \
+    MALLOC_DEBUG \
     MAKE \
     MAN \
     NCP \
Index: lib/libc/stdlib/jemalloc/Makefile.inc
===================================================================
--- lib/libc/stdlib/jemalloc/Makefile.inc	(revision 239733)
+++ lib/libc/stdlib/jemalloc/Makefile.inc	(working copy)
@@ -41,6 +41,6 @@
 	jemalloc.3 nallocm.3 \
 	jemalloc.3 malloc.conf.5
 
-.if defined(MALLOC_PRODUCTION)
+.if defined(MALLOC_PRODUCTION) || ${MK_MALLOC_DEBUG} == "no"
 CFLAGS+=	-DMALLOC_PRODUCTION
 .endif