diff --git a/lslopt/lslfoldconst.py b/lslopt/lslfoldconst.py
index 92b3d0b..caf8054 100644
--- a/lslopt/lslfoldconst.py
+++ b/lslopt/lslfoldconst.py
@@ -1009,6 +1009,14 @@ class foldconst(object):
                     # Convert llGetListLength(expr) to (expr != [])
                     node = {'nt':'CONST', 't':'list', 'value':[]}
                     parent[index] = node = {'nt':'!=', 't':'list', 'ch':[child[0], node]}
+                elif (node['name'] == 'llDumpList2String'
+                      and child[1]['nt'] == 'CONST'
+                      and child[1]['t'] in ('string', 'key')
+                      and child[1]['value'] == u""):
+                    # Convert llDumpList2String(expr, "") to (string)(expr)
+                    del child[1]
+                    node['nt'] = 'CAST'
+                    del node['name']
             elif SEFargs and 'SEF' in self.symtab[0][node['name']]:
                 # The function is marked as SEF in the symbol table, and the
                 # arguments are all side-effect-free. The result is SEF.