Index: generic/nsf.c
===================================================================
diff -u -N -r6ebbaeeee26137ccd4aaa4d6044de2c76adf7f98 -rd7bc5d6344a2648519087a1450071b28660b9977
--- generic/nsf.c	(.../nsf.c)	(revision 6ebbaeeee26137ccd4aaa4d6044de2c76adf7f98)
+++ generic/nsf.c	(.../nsf.c)	(revision d7bc5d6344a2648519087a1450071b28660b9977)
@@ -6752,7 +6752,8 @@
     if (nsPtr->deleteProc || nsPtr->clientData) {
       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));
+                name, (unsigned long)PTR2UINT(nsPtr->deleteProc),
+                nsPtr->clientData, (unsigned long)PTR2UINT(NSNamespaceDeleteProc));
     }
 
     {