diff --git a/Install_CMTK.py b/Install_CMTK.py
index 46e0af7..67fcce5 100644
--- a/Install_CMTK.py
+++ b/Install_CMTK.py
@@ -47,7 +47,7 @@ def untar_binaries(f,target_dir):
 	for binary in binaries:
 		frompath = os.path.join(td,binary.name)
 #		print 'from = '+frompath
-		shutil.move(frompath,target_dir)
+		cmtkgui.movefile(frompath,target_dir)
 	print("Cleaning up!")
 	shutil.rmtree(td)
 
diff --git a/cmtkgui.py b/cmtkgui.py
index 0789fd7..57d66be 100644
--- a/cmtkgui.py
+++ b/cmtkgui.py
@@ -368,3 +368,15 @@ def download_and_untar_url(download_url,target_dir,untarfun,download_file=None,
 	untarfun(tf.name,target_dir)
 	IJ.showStatus('Cleaning up!')
 	tf.close()
+
+def movefile(frompath, todir):
+	'''
+	move a file to a new location (renaming) using Java calls
+	needed because jython shutil.move has bugs
+	'''
+	if is_jython:
+		fromf=java.io.File(frompath)
+		tof=java.io.File(os.path.join(todir,os.path.basename(frompath)))
+		fromf.renameTo(tof)
+	else:
+		shutil.move(frompath, to)