diff --git a/ci/run-build-and-tests.sh b/ci/run-build-and-tests.sh
index 50e0b90..2279ff7 100755
--- a/ci/run-build-and-tests.sh
+++ b/ci/run-build-and-tests.sh
@@ -16,6 +16,7 @@
 	export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 	make test
 	export GIT_TEST_SPLIT_INDEX=yes
+	export GIT_TEST_MERGE_ALGORITHM=recursive
 	export GIT_TEST_FULL_IN_PACK_ARRAY=true
 	export GIT_TEST_OE_SIZE=10
 	export GIT_TEST_OE_DELTA_SIZE=5
diff --git a/t/test-lib.sh b/t/test-lib.sh
index 431adba..6f41850 100644
--- a/t/test-lib.sh
+++ b/t/test-lib.sh
@@ -448,6 +448,8 @@
 
 GIT_DEFAULT_HASH="${GIT_TEST_DEFAULT_HASH:-sha1}"
 export GIT_DEFAULT_HASH
+GIT_TEST_MERGE_ALGORITHM="${GIT_TEST_MERGE_ALGORITHM:-ort}"
+export GIT_TEST_MERGE_ALGORITHM
 
 # Tests using GIT_TRACE typically don't want <timestamp> <file>:<line> output
 GIT_TRACE_BARE=1