diff --git a/holoviews/core/overlay.py b/holoviews/core/overlay.py
index 6d683e590b..41697f07ef 100644
--- a/holoviews/core/overlay.py
+++ b/holoviews/core/overlay.py
@@ -110,9 +110,9 @@ def __getitem__(self, key):
 
     def get(self, identifier, default=None):
         if isinstance(identifier, int):
-            values = self.data.values()
+            values = list(self.data.values())
             if 0 <= identifier < len(values):
-                return self.data.values()[identifier]
+                return values[identifier]
             else:
                 return default
         return super(Overlay, self).get(identifier, default)