diff --git a/nifty6/library/correlated_fields.py b/nifty6/library/correlated_fields.py
index 656fac7cc85ebd617f70ff73dee3df7b657dd468..63a710fd9c3ae9d38d9392c568ca426fda47e327 100644
--- a/nifty6/library/correlated_fields.py
+++ b/nifty6/library/correlated_fields.py
@@ -520,7 +520,8 @@ class CorrelatedFieldMaker:
                  ' no unique set of amplitudes exist because only the',
                  ' relative scale is determined.')
             raise NotImplementedError(s)
-        expand = ContractionOperator(self._a[0].target, 1).adjoint
+        dom = self._a[0].target
+        expand = ContractionOperator(dom, len(dom)-1).adjoint
         return self._a[0]*(expand @ self.amplitude_total_offset)
 
     @property