diff --git a/t/unit-tests/t-reftable-tree.c b/t/unit-tests/t-reftable-tree.c
index 2220414a18..e7d774d774 100644
--- a/t/unit-tests/t-reftable-tree.c
+++ b/t/unit-tests/t-reftable-tree.c
@@ -15,15 +15,14 @@ static int t_compare(const void *a, const void *b)
 }
 
 struct curry {
-	void *last;
+	void **arr;
+	size_t len;
 };
 
-static void check_increasing(void *arg, void *key)
+static void store(void *arg, void *key)
 {
 	struct curry *c = arg;
-	if (c->last)
-		check_int(t_compare(c->last, key), <, 0);
-	c->last = key;
+	c->arr[c->len++] = key;
 }
 
 static void t_tree_search(void)
@@ -55,15 +54,24 @@ static void t_infix_walk(void)
 {
 	struct tree_node *root = NULL;
 	void *values[11] = { 0 };
-	struct curry c = { 0 };
+	void *out[11] = { 0 };
+	struct curry c = {
+		.arr = (void **) &out,
+	};
 	size_t i = 1;
+	size_t count = 0;
 
 	do {
 		tree_search(&values[i], &root, t_compare, 1);
 		i = (i * 7) % 11;
+		count++;
 	} while (i != 1);
 
-	infix_walk(root, &check_increasing, &c);
+	infix_walk(root, &store, &c);
+	for (i = 1; i < ARRAY_SIZE(values); i++)
+		check_pointer_eq(&values[i], out[i - 1]);
+	check(!out[i - 1]);
+	check_int(c.len, ==, count);
 	tree_free(root);
 }