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diff --git a/third_party/git/t/t3409-rebase-preserve-merges.sh b/third_party/git/t/t3409-rebase-preserve-merges.sh
new file mode 100755
index 000000000000..3b340f1ece36
--- /dev/null
+++ b/third_party/git/t/t3409-rebase-preserve-merges.sh
@@ -0,0 +1,127 @@
+#!/bin/sh
+#
+# Copyright(C) 2008 Stephen Habermann & Andreas Ericsson
+#
+test_description='git rebase -p should preserve merges
+
+Run "git rebase -p" and check that merges are properly carried along
+'
+. ./test-lib.sh
+
+if ! test_have_prereq REBASE_P; then
+	skip_all='skipping git rebase -p tests, as asked for'
+	test_done
+fi
+
+GIT_AUTHOR_EMAIL=bogus_email_address
+export GIT_AUTHOR_EMAIL
+
+# Clone 2 (conflicting merge):
+#
+# A1--A2--B3   <-- origin/master
+#  \       \
+#   B1------M  <-- topic
+#    \
+#     B2       <-- origin/topic
+#
+# Clone 3 (no-ff merge):
+#
+# A1--A2--B3   <-- origin/master
+#  \
+#   B1------M  <-- topic
+#    \     /
+#     \--A3    <-- topic2
+#      \
+#       B2     <-- origin/topic
+#
+# Clone 4 (same as Clone 3)
+
+test_expect_success 'setup for merge-preserving rebase' \
+	'echo First > A &&
+	git add A &&
+	git commit -m "Add A1" &&
+	git checkout -b topic &&
+	echo Second > B &&
+	git add B &&
+	git commit -m "Add B1" &&
+	git checkout -f master &&
+	echo Third >> A &&
+	git commit -a -m "Modify A2" &&
+	echo Fifth > B &&
+	git add B &&
+	git commit -m "Add different B" &&
+
+	git clone ./. clone2 &&
+	(
+		cd clone2 &&
+		git checkout -b topic origin/topic &&
+		test_must_fail git merge origin/master &&
+		echo Resolved >B &&
+		git add B &&
+		git commit -m "Merge origin/master into topic"
+	) &&
+
+	git clone ./. clone3 &&
+	(
+		cd clone3 &&
+		git checkout -b topic2 origin/topic &&
+		echo Sixth > A &&
+		git commit -a -m "Modify A3" &&
+		git checkout -b topic origin/topic &&
+		git merge --no-ff topic2
+	) &&
+
+	git clone ./. clone4 &&
+	(
+		cd clone4 &&
+		git checkout -b topic2 origin/topic &&
+		echo Sixth > A &&
+		git commit -a -m "Modify A3" &&
+		git checkout -b topic origin/topic &&
+		git merge --no-ff topic2
+	) &&
+
+	git checkout topic &&
+	echo Fourth >> B &&
+	git commit -a -m "Modify B2"
+'
+
+test_expect_success '--continue works after a conflict' '
+	(
+	cd clone2 &&
+	git fetch &&
+	test_must_fail git rebase -p origin/topic &&
+	test 2 = $(git ls-files B | wc -l) &&
+	echo Resolved again > B &&
+	test_must_fail git rebase --continue &&
+	grep "^@@@ " .git/rebase-merge/patch &&
+	git add B &&
+	git rebase --continue &&
+	test 1 = $(git rev-list --all --pretty=oneline | grep "Modify A" | wc -l) &&
+	test 1 = $(git rev-list --all --pretty=oneline | grep "Add different" | wc -l) &&
+	test 1 = $(git rev-list --all --pretty=oneline | grep "Merge origin" | wc -l)
+	)
+'
+
+test_expect_success 'rebase -p preserves no-ff merges' '
+	(
+	cd clone3 &&
+	git fetch &&
+	git rebase -p origin/topic &&
+	test 3 = $(git rev-list --all --pretty=oneline | grep "Modify A" | wc -l) &&
+	test 1 = $(git rev-list --all --pretty=oneline | grep "Merge branch" | wc -l)
+	)
+'
+
+test_expect_success 'rebase -p ignores merge.log config' '
+	(
+	cd clone4 &&
+	git fetch &&
+	git -c merge.log=1 rebase -p origin/topic &&
+	echo >expected &&
+	git log --format="%b" -1 >current &&
+	test_cmp expected current
+	)
+'
+
+test_done