diff --git a/src/builtin/list.rs b/src/builtin/list.rs
index 192dc59..6d3f004 100644
--- a/src/builtin/list.rs
+++ b/src/builtin/list.rs
@@ -221,6 +221,7 @@ pub(crate) fn register(f: &mut HashMap<String, Builtin>) {
             max_args!(args, 2);
             let list = match arg!(args, 0, "list") {
                 Value::List(v, ..) => v,
+                Value::Map(m) => m.entries(),
                 v => vec![v],
             };
             let value = arg!(args, 1, "value");
diff --git a/tests/list.rs b/tests/list.rs
index 4f28b28..56ca1a9 100644
--- a/tests/list.rs
+++ b/tests/list.rs
@@ -288,8 +288,8 @@ test!(
     "a {\n  color: index(1px solid red, dashed);\n}\n",
     ""
 );
-// test!(
-//     index_found_map,
-//     "a {\n  color: index((width: 10px, height: 20px), (height 20px));\n}\n",
-//     "a {\n  color: 2;\n}\n"
-// );
+test!(
+    index_found_map,
+    "a {\n  color: index((width: 10px, height: 20px), (height 20px));\n}\n",
+    "a {\n  color: 2;\n}\n"
+);