diff --git a/eos/saveddata/implantSet.py b/eos/saveddata/implantSet.py
index ca0334fff..46b6876c3 100644
--- a/eos/saveddata/implantSet.py
+++ b/eos/saveddata/implantSet.py
@@ -48,7 +48,7 @@ class ImplantSet(object):
 
         return out.strip()
 
-    def __deepcopy__(self):
+    def __deepcopy__(self, memo):
         copy = ImplantSet(self.name)
         copy.name = "%s copy" % self.name