diff --git a/Makefile.in b/Makefile.in
index 139e20a8c..af758d035 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -552,6 +552,7 @@ tests interop-tests t-exec: regress-prep regress-binaries $(TARGETS)
 		OBJ="$${BUILDDIR}/regress/" \
 		PATH="$${BUILDDIR}:$${PATH}" \
 		TEST_ENV=MALLOC_OPTIONS="@TEST_MALLOC_OPTIONS@" \
+		TEST_MALLOC_OPTIONS="@TEST_MALLOC_OPTIONS@" \
 		TEST_SSH_SCP="$${TEST_SSH_SCP}" \
 		TEST_SSH_SSH="$${TEST_SSH_SSH}" \
 		TEST_SSH_SSHD="$${TEST_SSH_SSHD}" \
diff --git a/regress/connect-privsep.sh b/regress/connect-privsep.sh
index 9a51f5690..ea739f614 100644
--- a/regress/connect-privsep.sh
+++ b/regress/connect-privsep.sh
@@ -26,7 +26,12 @@ done
 
 # Because sandbox is sensitive to changes in libc, especially malloc, retest
 # with every malloc.conf option (and none).
-for m in '' A F G H J P R S X '<' '>'; do
+if [ -z "TEST_MALLOC_OPTIONS" ]; then
+	mopts="A F G H J P R S X < >"
+else
+	mopts=`echo $TEST_MALLOC_OPTIONS | sed 's/./& /g'`
+fi
+for m in '' $mopts ; do
     for p in ${SSH_PROTOCOLS}; do
 	env MALLOC_OPTIONS="$m" ${SSH} -$p -F $OBJ/ssh_proxy 999.999.999.999 true
 	if [ $? -ne 0 ]; then