diff --git a/line-log.c b/line-log.c
index bca9bd8040..bc67b75d10 100644
--- a/line-log.c
+++ b/line-log.c
@@ -1237,6 +1237,7 @@ static int process_ranges_merge_commit(struct rev_info *rev, struct commit *comm
 			 * don't follow any other path in history
 			 */
 			add_line_range(rev, parents[i], cand[i]);
+			free_commit_list(commit->parents);
 			commit_list_append(parents[i], &commit->parents);
 
 			ret = 0;
diff --git a/t/t4211-line-log.sh b/t/t4211-line-log.sh
index 950451cf6a..1d6dd982a2 100755
--- a/t/t4211-line-log.sh
+++ b/t/t4211-line-log.sh
@@ -4,6 +4,7 @@ test_description='test log -L'
 GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME=main
 export GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup (import history)' '