Index: generic/nsf.c
===================================================================
diff -u -rf92df553a299a7ef91e1d53656282e23441f8c87 -r6ebbaeeee26137ccd4aaa4d6044de2c76adf7f98
--- generic/nsf.c	(.../nsf.c)	(revision f92df553a299a7ef91e1d53656282e23441f8c87)
+++ generic/nsf.c	(.../nsf.c)	(revision 6ebbaeeee26137ccd4aaa4d6044de2c76adf7f98)
@@ -6750,8 +6750,8 @@
      * Avoid hijacking a namespace with different client data
      */
     if (nsPtr->deleteProc || nsPtr->clientData) {
-      Tcl_Panic("Namespace '%s' exists already with delProc 0x%x and clientData %p; "
-                "Can only convert a plain Tcl namespace into an NSF namespace, my delete proc 0x%x",
+      Tcl_Panic("Namespace '%s' exists already with delProc 0x%" PRIxPTR " and clientData %p; "
+                "Can only convert a plain Tcl namespace into an NSF namespace, my delete proc 0x%" PRIxPTR,
                 name, PTR2UINT(nsPtr->deleteProc), nsPtr->clientData, PTR2UINT(NSNamespaceDeleteProc));
     }