diff --git a/lib/bb/fetch2/cvs.py b/lib/bb/fetch2/cvs.py
index 6a948c4..5249d85 100644
--- a/lib/bb/fetch2/cvs.py
+++ b/lib/bb/fetch2/cvs.py
@@ -111,8 +111,10 @@
         if ud.tag:
             options.append("-r %s" % ud.tag)
 
+        localdata = data.createCopy(d)
+        
         cvsbasecmd = d.getVar("FETCHCMD_cvs", True)
-        cvscmd = cvsbasecmd + "'-d" + cvsroot + "' co " + " ".join(options) + " " + ud.module
+        cvscmd = cvsbasecmd + " " + "'-d" + cvsroot + "' co " + " ".join(options) + " " + ud.module
         cvsupdatecmd = cvsbasecmd + "'-d" + cvsroot + "' update -d -P " + " ".join(options)
 
         if cvs_rsh: