diff --git a/src/beast/base/inference/parameter/Parameter.java b/src/beast/base/inference/parameter/Parameter.java
index 5b1efdff..cdf10181 100644
--- a/src/beast/base/inference/parameter/Parameter.java
+++ b/src/beast/base/inference/parameter/Parameter.java
@@ -6,6 +6,7 @@
 import beast.base.core.Description;
 import beast.base.core.Function;
 import beast.base.core.Input;
+import beast.base.core.Log;
 import beast.base.inference.StateNode;
 
 import java.io.PrintStream;
@@ -513,7 +514,8 @@ public void assignFrom(final StateNode other) {
         @Override
         public void assignFromFragile(final StateNode other) {
             @SuppressWarnings("unchecked") final Parameter.Base<T> source = (Parameter.Base<T>) other;
-            System.arraycopy(source.values, 0, values, 0, Math.min(values.length, source.getDimension()));
+            this.setDimension(source.values.length);
+            System.arraycopy(source.values, 0, values, 0, source.values.length);
             Arrays.fill(m_bIsDirty, false);
         }