diff --git a/src/merge.c b/src/merge.c
index 42fbd79c9..24b7d37ce 100644
--- a/src/merge.c
+++ b/src/merge.c
@@ -2629,9 +2629,8 @@ int git_merge(
 on_error:
 	merge_state_cleanup(repo);
 
-	git_index_free(index_new);
-
 done:
+	git_index_free(index_new);
 	git_index_free(index_repo);
 
 	git_tree_free(ancestor_tree);
diff --git a/tests/revwalk/hidecb.c b/tests/revwalk/hidecb.c
index c13a17747..26ff183fa 100644
--- a/tests/revwalk/hidecb.c
+++ b/tests/revwalk/hidecb.c
@@ -48,18 +48,27 @@ void test_revwalk_hidecb__cleanup(void)
 /* Hide all commits */
 static int hide_every_commit_cb(const git_oid *commit_id, void *data)
 {
+	GIT_UNUSED(commit_id);
+	GIT_UNUSED(data);
+
 	return 1;
 }
 
 /* Do not hide anything */
 static int hide_none_cb(const git_oid *commit_id, void *data)
 {
+	GIT_UNUSED(commit_id);
+	GIT_UNUSED(data);
+
 	return 0;
 }
 
 /* Hide some commits */
 static int hide_commit_cb(const git_oid *commit_id, void *data)
 {
+	GIT_UNUSED(commit_id);
+	GIT_UNUSED(data);
+
 	if (0 == git_oid_cmp(commit_id, &commit_ids[5]))
 		return 1;
 	else