Index: libpolyml/xwindows.cpp
--- libpolyml/xwindows.cpp.orig
+++ libpolyml/xwindows.cpp
@@ -7274,7 +7274,7 @@ static void DebugPrintWord(PolyWord P /* was X_Object 
                              : printf("Old Display <%p>",P.AsAddress()));
             return;
             
-        default:         printf("Pointer "ZERO_X"%p",P.AsAddress());
+        default:         printf("Pointer " ZERO_X "%p",P.AsAddress());
             return;
         }
     }
