diff --git a/Source/kwsys/CommandLineArguments.cxx b/Source/kwsys/CommandLineArguments.cxx
index 909c33f2d..0eca02af2 100644
--- a/Source/kwsys/CommandLineArguments.cxx
+++ b/Source/kwsys/CommandLineArguments.cxx
@@ -89,7 +89,7 @@ CommandLineArguments::~CommandLineArguments()
 }
 
 //----------------------------------------------------------------------------
-void CommandLineArguments::Initialize(int argc, char* argv[])
+void CommandLineArguments::Initialize(int argc, const char* const argv[])
 {
   int cc;
 
diff --git a/Source/kwsys/CommandLineArguments.hxx.in b/Source/kwsys/CommandLineArguments.hxx.in
index f4893b544..70ef2d304 100644
--- a/Source/kwsys/CommandLineArguments.hxx.in
+++ b/Source/kwsys/CommandLineArguments.hxx.in
@@ -85,7 +85,7 @@ public:
   /**
    * Initialize internal data structures. This should be called before parsing.
    */
-  void Initialize(int argc, char* argv[]);
+  void Initialize(int argc, const char* const argv[]);
 
   /**
    * Initialize internal data structure and pass arguments one by one. This is