diff --git a/chrome/content/vimperator/commands.js b/chrome/content/vimperator/commands.js
index 679a95ff..742699bc 100644
--- a/chrome/content/vimperator/commands.js
+++ b/chrome/content/vimperator/commands.js
@@ -187,12 +187,7 @@ function Commands()//{{{
 
     function addDefaultCommand(command)
     {
-        if (!command)
-            return false;
-
         ex_commands.push(command);
-
-        return true;
     }
 
     function commandsIterator()
diff --git a/chrome/content/vimperator/mappings.js b/chrome/content/vimperator/mappings.js
index 757a739a..8ba2aa5a 100644
--- a/chrome/content/vimperator/mappings.js
+++ b/chrome/content/vimperator/mappings.js
@@ -66,14 +66,10 @@ function Mappings()//{{{
 
     function addDefaultMap(map)
     {
-        if (!map)
-            return false;
-
         if (!main[map.mode])
             main[map.mode] = [];
 
         main[map.mode].push(map);
-        return true;
     }
 
     function getFrom(mode, cmd, stack)