diff --git a/Source/kwsys/SystemTools.cxx b/Source/kwsys/SystemTools.cxx
index 45e7175444..d2f138f059 100644
--- a/Source/kwsys/SystemTools.cxx
+++ b/Source/kwsys/SystemTools.cxx
@@ -836,7 +836,7 @@ kwsys_stl::string SystemTools::AddSpaceBetweenCapitalizedWords(
         {
         n += ' ';
         }
-      n += s[0];
+      n += s[i];
       }
     }
   return n;