diff --git a/Source/kwsys/SystemTools.cxx b/Source/kwsys/SystemTools.cxx
index fd0a19bfce..9b7a6ed8e0 100644
--- a/Source/kwsys/SystemTools.cxx
+++ b/Source/kwsys/SystemTools.cxx
@@ -3336,7 +3336,7 @@ SystemTools
   while(first != last)
     {
     result.append("/");
-    result.append(*first++);
+    result.append((*first++));
     }
 
   // Return the concatenated result.