diff --git a/src/__init__.py b/src/__init__.py
index 312a43ad8886ba2dad7c1373ca9848eae69bb646..e4799d9620da505320f15c4b6712e5456d132959 100644
--- a/src/__init__.py
+++ b/src/__init__.py
@@ -725,7 +725,8 @@ def indices_in_shape(shape):
     else:
         remainder = shape[1:]
         for i in xrange(0, shape[0]):
-            yield (i,)+indices_in_shape(remainder)
+            for rest in indices_in_shape(remainder):
+                yield (i,)+rest