diff --git a/Lib/test/test_tcl.py b/Lib/test/test_tcl.py
--- a/Lib/test/test_tcl.py
+++ b/Lib/test/test_tcl.py
@@ -148,6 +148,7 @@
         with test_support.EnvironmentVarGuard() as env:
             env.unset("TCL_LIBRARY")
             cmd = '%s -c "import Tkinter; print Tkinter"' % (unc_name,)
+            print '\n\n' + cmd + '\n\n'
 
             p = Popen(cmd, stdout=PIPE, stderr=PIPE)
             out_data, err_data = p.communicate()
diff --git a/Tools/buildbot/test.bat b/Tools/buildbot/test.bat
--- a/Tools/buildbot/test.bat
+++ b/Tools/buildbot/test.bat
@@ -1,3 +1,11 @@
 @rem Used by the buildbot "test" step.
-cd PCbuild
-call rt.bat -d -q -uall -rwW %1 %2 %3 %4 %5 %6 %7 %8 %9
+
+setlocal
+
+pushd PCbuild
+
+PATH %PATH%;%CD%\..\..\tcltk\bin
+
+cmd /C python_d -m test.regrtest -v -uall %1 %2 %3 %4 %5 test_tcl test_tk test_ttk_guionly test_ttk_textonly
+
+popd