diff --git a/bitbake/lib/bb/siggen.py b/bitbake/lib/bb/siggen.py
index 92066da00c..89b70fb6a4 100644
--- a/bitbake/lib/bb/siggen.py
+++ b/bitbake/lib/bb/siggen.py
@@ -201,9 +201,6 @@ class SignatureGenerator(object):
     def save_unitaskhashes(self):
         return
 
-    def copy_unitaskhashes(self, targetdir):
-        return
-
     def set_setscene_tasks(self, setscene_tasks):
         return
 
@@ -418,9 +415,6 @@ class SignatureGeneratorBasic(SignatureGenerator):
     def save_unitaskhashes(self):
         self.unihash_cache.save(self.unitaskhashes)
 
-    def copy_unitaskhashes(self, targetdir):
-        self.unihash_cache.copyfile(targetdir)
-
     def dump_sigtask(self, mcfn, task, stampbase, runtime):
         tid = mcfn + ":" + task
         mc = bb.runqueue.mc_from_tid(mcfn)