diff --git a/modules/yaourt/manifests/keys.pp b/modules/yaourt/manifests/keys.pp
index e1eecc4..5f38c83 100644
--- a/modules/yaourt/manifests/keys.pp
+++ b/modules/yaourt/manifests/keys.pp
@@ -19,6 +19,7 @@ class yaourt::keys () {
       unless => "pacman-key --list-keys $key"
     }
     exec { "pacman-key --lsign-key $key":
+      unless => "pacman-key --list-keys $key | grep '\[  full  \]'"
     }
   }
 }