Index: generic/nsf.c
===================================================================
diff -u -rb86d03353b81c9911bc420967a16a02a14d736c5 -rc3085d62059a162dd330cb5b389b440095a419a0
--- generic/nsf.c	(.../nsf.c)	(revision b86d03353b81c9911bc420967a16a02a14d736c5)
+++ generic/nsf.c	(.../nsf.c)	(revision c3085d62059a162dd330cb5b389b440095a419a0)
@@ -4808,7 +4808,7 @@
         if (unlikely(varName[0] == localName[0]
                      && varName[1] == localName[1]
                      && len == nameLength
-                     && strcmp(varName, localName) == 0)) {
+                     && memcmp(varName, localName, (size_t)len) == 0)) {
           return (Tcl_Var) &varFramePtr->compiledLocals[i];
         }
       }
@@ -4908,7 +4908,7 @@
 
         if (varName[1] == localName[1]
             && len == nameLength
-            && strcmp(varName, localName) == 0) {
+            && memcmp(varName, localName, (size_t)len) == 0) {
           result = var;
         }