diff --git a/slpkg/slackbuild.py b/slpkg/slackbuild.py
index 8181beee..3ee33732 100644
--- a/slpkg/slackbuild.py
+++ b/slpkg/slackbuild.py
@@ -135,7 +135,7 @@ class Slackbuilds:
 
     def creating_main_for_build(self):
         """ List with the main slackbuilds. """
-        [self.install_order.append(main) for main in self.sbos.keys()]
+        [self.install_order.append(main) for main in self.sbos.keys() if main not in self.install_order]
 
     def view_before_build(self):
         """ View slackbuilds before proceed. """