diff --git a/src/serialize.js b/src/serialize.js
index f23f5b2..6659b07 100644
--- a/src/serialize.js
+++ b/src/serialize.js
@@ -134,28 +134,31 @@ function replaceRecord(rec, replaceChild) {
 }
 
 function getIterableType(iterable) {
-  switch (iterable.constructor) {
-    case immutable.List:
-      return 'List'
+  if (immutable.List.isList(iterable)) {
+    return 'List'
+  }
 
-    case immutable.Set:
-      return 'Set'
+  if (immutable.Stack.isStack(iterable)) {
+    return 'Stack'
+  }
 
-    case immutable.OrderedSet:
+  if (immutable.Set.isSet(iterable)) {
+    if (immutable.OrderedSet.isOrderedSet(iterable)) {
       return 'OrderedSet'
+    }
 
-    case immutable.Stack:
-      return 'Stack'
-
-    case immutable.Map:
-      return 'Map'
+    return 'Set'
+  }
 
-    case immutable.OrderedMap:
+  if (immutable.Map.isMap(iterable)) {
+    if (immutable.OrderedMap.isOrderedMap(iterable)) {
       return 'OrderedMap'
+    }
 
-    default:
-      return undefined
+    return 'Map'
   }
+
+  return undefined;
 }