diff --git a/lib/Support/CommandLine.cpp b/lib/Support/CommandLine.cpp
index 194dd33..c3f18bd 100644
--- a/lib/Support/CommandLine.cpp
+++ b/lib/Support/CommandLine.cpp
@@ -346,7 +346,7 @@
     return error(": unrecognized alternative '" + Arg +
                  "'!  Alternatives are: " + Alternatives);
   }
-  Value = ValueMap[i].second.first;
+  setValue(ValueMap[i].second.first);
   return false;
 }