diff --git a/Tools/buildbot/external-amd64.bat b/Tools/buildbot/external-amd64.bat
index 5b3c5f6..902e37a 100644
--- a/Tools/buildbot/external-amd64.bat
+++ b/Tools/buildbot/external-amd64.bat
@@ -12,7 +12,7 @@
 )
 
 if not exist tcltk64\bin\tk85g.dll (
-    cd tk-8.5.2.1\win    
+    cd tk-8.5.2.0\win    
     nmake -f makefile.vc COMPILERFLAGS=-DWINVER=0x0500 OPTS=noxp DEBUG=1 MACHINE=AMD64 INSTALLDIR=..\..\tcltk64 TCLDIR=..\..\tcl-8.5.2.1 clean
     nmake -f makefile.vc COMPILERFLAGS=-DWINVER=0x0500 OPTS=noxp DEBUG=1 MACHINE=AMD64 INSTALLDIR=..\..\tcltk64 TCLDIR=..\..\tcl-8.5.2.1 all
     nmake -f makefile.vc COMPILERFLAGS=-DWINVER=0x0500 OPTS=noxp DEBUG=1 MACHINE=AMD64 INSTALLDIR=..\..\tcltk64 TCLDIR=..\..\tcl-8.5.2.1 install