diff --git a/src/mdevaluate/coordinates.py b/src/mdevaluate/coordinates.py
index 722ca5b..d3f3c60 100755
--- a/src/mdevaluate/coordinates.py
+++ b/src/mdevaluate/coordinates.py
@@ -218,7 +218,7 @@ class Coordinates:
             self.get_frame.clear_cache()
 
     def __iter__(self):
-        for i in range(len(self))[self._slice]:
+        for i in range(len(self.frames))[self._slice]:
             yield self[i]
 
     @singledispatchmethod