diff --git a/lib/ruby-lint/definitions/core/env.rb b/lib/ruby-lint/definitions/core/env.rb
index <HASH>..<HASH> 100644
--- a/lib/ruby-lint/definitions/core/env.rb
+++ b/lib/ruby-lint/definitions/core/env.rb
@@ -4,6 +4,7 @@
 # Platform: rbx 2.0.0.rc1
 #
 RubyLint::GlobalScope.definitions.define_constant('ENV') do |klass|
+  klass.inherits(RubyLint::GlobalScope.constant_proxy('Hash'))
 end
 
-RubyLint::GlobalScope.definitions.lookup(:const, 'ENV').deep_freeze
\ No newline at end of file
+RubyLint::GlobalScope.definitions.lookup(:const, 'ENV').deep_freeze
ENV should inherit from Hash.

Although technically not true the class of ENV is "undefined" between Ruby
implementations. Since it behaves like a Hash this the closest and easiest
solution.