diff --git a/activesupport/lib/active_support/dependencies.rb b/activesupport/lib/active_support/dependencies.rb
index 107f6649609c2b3d0612a87748e57f6ed9461bff..da1050298bd4e4e143e29b8016039b10318dfbb9 100644
--- a/activesupport/lib/active_support/dependencies.rb
+++ b/activesupport/lib/active_support/dependencies.rb
@@ -77,7 +77,6 @@ def get(key)
 
       def new_constants_for(frames)
         frames.map do |mod_name, prior_constants|
-          mod = Inflector.constantize(mod_name)
           mod = Inflector.constantize(mod_name) if Dependencies.qualified_const_defined?(mod_name)
           next unless mod.is_a?(Module)