diff --git a/meta/lib/oe/package_manager.py b/meta/lib/oe/package_manager.py
index 607e7c6eaa..919104f107 100644
--- a/meta/lib/oe/package_manager.py
+++ b/meta/lib/oe/package_manager.py
@@ -164,8 +164,8 @@ class OpkgIndexer(Indexer):
         if not os.path.exists(os.path.join(self.deploy_dir, "Packages")):
             open(os.path.join(self.deploy_dir, "Packages"), "w").close()
 
-        index_cmds = []
-        index_sign_files = []
+        index_cmds = set()
+        index_sign_files = set()
         for arch_var in arch_vars:
             archs = self.d.getVar(arch_var, True)
             if archs is None:
@@ -181,10 +181,10 @@ class OpkgIndexer(Indexer):
                 if not os.path.exists(pkgs_file):
                     open(pkgs_file, "w").close()
 
-                index_cmds.append('%s -r %s -p %s -m %s' %
+                index_cmds.add('%s -r %s -p %s -m %s' %
                                   (opkg_index_cmd, pkgs_file, pkgs_file, pkgs_dir))
 
-                index_sign_files.append(pkgs_file)
+                index_sign_files.add(pkgs_file)
 
         if len(index_cmds) == 0:
             bb.note("There are no packages in %s!" % self.deploy_dir)