diff --git a/notes.c b/notes.c
index 6a157e34ce..244b5c4b1c 100644
--- a/notes.c
+++ b/notes.c
@@ -1219,11 +1219,16 @@ void prune_notes(struct notes_tree *t, int flags)
 	for_each_note(t, 0, prune_notes_helper, &l);
 
 	while (l) {
+		struct note_delete_list *next;
+
 		if (flags & NOTES_PRUNE_VERBOSE)
 			printf("%s\n", hash_to_hex(l->sha1));
 		if (!(flags & NOTES_PRUNE_DRYRUN))
 			remove_note(t, l->sha1);
-		l = l->next;
+
+		next = l->next;
+		free(l);
+		l = next;
 	}
 }
 
diff --git a/t/t3306-notes-prune.sh b/t/t3306-notes-prune.sh
index 8f4102ff9e..b6e9f643e3 100755
--- a/t/t3306-notes-prune.sh
+++ b/t/t3306-notes-prune.sh
@@ -2,6 +2,7 @@
 
 test_description='Test git notes prune'
 
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 test_expect_success 'setup: create a few commits with notes' '