diff --git a/sphinx/directives/__init__.py b/sphinx/directives/__init__.py
index 52e6e6fba..d2b70b82f 100644
--- a/sphinx/directives/__init__.py
+++ b/sphinx/directives/__init__.py
@@ -149,11 +149,12 @@ class ObjectDescription(Directive):
                 signode.clear()
                 signode += addnodes.desc_name(sig, sig)
                 continue  # we don't want an index entry here
-            self.names.append(name)
-            if not noindex and name not in self.names:
-                # only add target and index entry if this is the first
-                # description of the object with this name in this desc block
-                self.add_target_and_index(name, sig, signode)
+            if name not in self.names:
+                self.names.append(name)
+                if not noindex:
+                    # only add target and index entry if this is the first
+                    # description of the object with this name in this desc block
+                    self.add_target_and_index(name, sig, signode)
 
         contentnode = addnodes.desc_content()
         node.append(contentnode)