diff --git a/reclass/datatypes/tests/test_parameters.py b/reclass/datatypes/tests/test_parameters.py
index 5ed85b4..97fb924 100644
--- a/reclass/datatypes/tests/test_parameters.py
+++ b/reclass/datatypes/tests/test_parameters.py
@@ -324,5 +324,20 @@
         p1.interpolate()
         self.assertEqual(p1.as_dict(), r)
 
+    def test_merge_referenced_lists(self):
+        p1 = Parameters({'one': [ 1, 2, 3 ], 'two': [ 4, 5, 6 ], 'three': '${one}'})
+        p2 = Parameters({'three': '${two}'})
+        r = {'one': [ 1, 2, 3 ], 'two': [ 4, 5, 6], 'three': [ 1, 2, 3, 4, 5, 6 ]}
+        p1.merge(p2)
+        p1.interpolate()
+        self.assertEqual(p1.as_dict(), r)
+
+    def test_merge_referenced_dicts(self):
+        p1 = Parameters({'one': {'a': 1, 'b': 2}, 'two': {'c': 3, 'd': 4}, 'three': '${one}'})
+        p2 = Parameters({'three': '${two}'})
+        r = {'one': {'a': 1, 'b': 2}, 'two': {'c': 3, 'd': 4}, 'three': {'a': 1, 'b': 2, 'c': 3, 'd': 4}}
+        p1.merge(p2)
+        p1.interpolate()
+        self.assertEqual(p1.as_dict(), r)
 if __name__ == '__main__':
     unittest.main()
diff --git a/reclass/utils/valuelist.py b/reclass/utils/valuelist.py
index 4e9e3d3..5e57f6f 100644
--- a/reclass/utils/valuelist.py
+++ b/reclass/utils/valuelist.py
@@ -4,6 +4,8 @@
 # This file is part of reclass
 #
 
+import copy
+
 from reclass.utils.mergeoptions import MergeOptions
 
 class ValueList(object):
@@ -65,6 +67,8 @@
         for n, value in enumerate(self._values):
             if n is 0:
                 output = self._values[0].render(context, options)
+                if isinstance(output, list):
+                    output = copy.deepcopy(output)
             else:
                 new = value.render(context, options)
                 if isinstance(output, dict) and isinstance(new, dict):