diff --git a/lib/Driver/OptTable.cpp b/lib/Driver/OptTable.cpp
index 3c36314..d919c66 100644
--- a/lib/Driver/OptTable.cpp
+++ b/lib/Driver/OptTable.cpp
@@ -226,7 +226,8 @@
   return new Arg(TheUnknownOption, Index++, Str);
 }
 
-InputArgList *OptTable::ParseArgs(const char **ArgBegin, const char **ArgEnd,
+InputArgList *OptTable::ParseArgs(const char* const *ArgBegin,
+                                  const char* const *ArgEnd,
                                   unsigned &MissingArgIndex,
                                   unsigned &MissingArgCount) const {
   InputArgList *Args = new InputArgList(ArgBegin, ArgEnd);