diff --git a/MyAdventures/mcpi/util.py b/MyAdventures/mcpi/util.py
index 9791072..8f8613f 100644
--- a/MyAdventures/mcpi/util.py
+++ b/MyAdventures/mcpi/util.py
@@ -2,7 +2,7 @@
 
 def flatten(l):
     for e in l:
-        if isinstance(e, collections.Iterable) and not isinstance(e, str):
+        if isinstance(e, collections.abc.Iterable) and not isinstance(e, str):
             for ee in flatten(e): yield ee
         else: yield e