diff --git a/lldb/source/Interpreter/OptionValueProperties.cpp b/lldb/source/Interpreter/OptionValueProperties.cpp
index 0df378235cfa..abee55d93efa 100644
--- a/lldb/source/Interpreter/OptionValueProperties.cpp
+++ b/lldb/source/Interpreter/OptionValueProperties.cpp
@@ -651,6 +651,7 @@ lldb::OptionValueSP
 OptionValueProperties::DeepCopy () const
 {
     assert(!"this shouldn't happen");
+    return lldb::OptionValueSP();
 }
 
 const Property *