diff --git a/meta/classes-global/sstate.bbclass b/meta/classes-global/sstate.bbclass
index 2c259a6657..eb988b2ca8 100644
--- a/meta/classes-global/sstate.bbclass
+++ b/meta/classes-global/sstate.bbclass
@@ -747,10 +747,11 @@ def pstaging_fetch(sstatefetch, d):
         uris += ['file://{0}.sig;downloadfilename={0}.sig'.format(sstatefetch)]
 
     for srcuri in uris:
-        localdata.delVar('SRC_URI')
-        localdata.setVar('SRC_URI', srcuri)
+        localdata2 = bb.data.createCopy(localdata)
+        localdata2.delVar('SRC_URI')
+        localdata2.setVar('SRC_URI', srcuri)
         try:
-            fetcher = bb.fetch2.Fetch([srcuri], localdata, cache=False)
+            fetcher = bb.fetch2.Fetch([srcuri], localdata2, cache=False)
             fetcher.checkstatus()
             fetcher.download()