Index: generic/nsf.c
===================================================================
diff -u -r03b838a7c3ffc5854115254d5dc2e3f90223eda4 -rabfaf40513a46d383b26225ae222b5f48bbb1d7b
--- generic/nsf.c	(.../nsf.c)	(revision 03b838a7c3ffc5854115254d5dc2e3f90223eda4)
+++ generic/nsf.c	(.../nsf.c)	(revision abfaf40513a46d383b26225ae222b5f48bbb1d7b)
@@ -5712,7 +5712,7 @@
           /* The variable might have been brought back by an unset trace, plus
              newly created unset traces; deactivate *all* traces on revived vars. */
           if (TclIsVarTraced(varPtr)) {
-            Tcl_HashEntry *tPtr = Tcl_FindHashEntry(&iPtr->varTraces, varPtr);
+            Tcl_HashEntry *tPtr = Tcl_FindHashEntry(&iPtr->varTraces, (const char *)varPtr);
             VarTrace *tracePtr = Tcl_GetHashValue(tPtr);
             ActiveVarTrace *activePtr;