diff --git a/lib/ipaddress.rb b/lib/ipaddress.rb
index 8b224312848bd8d32e94e3b2447b51f6bcc33a91..19b526f3cb1186e5308dc0cc39680caa600af4b0 100644
--- a/lib/ipaddress.rb
+++ b/lib/ipaddress.rb
@@ -214,7 +214,7 @@ end
 #
 # Compatibility with Ruby 1.8
 #
-if RUBY_VERSION =~ /1\.8/
+if RUBY_VERSION =~ /^1\.8/
   class Hash # :nodoc:
     alias :key :index
   end
diff --git a/lib/ipaddress/version.rb b/lib/ipaddress/version.rb
index 6aa96dea4d70889d815f561ef125a0c6dc59ab9d..f637ef81a55604bfe1514af300fa2529349b1d23 100644
--- a/lib/ipaddress/version.rb
+++ b/lib/ipaddress/version.rb
@@ -1,3 +1,3 @@
 module Ipaddress
-  VERSION = "0.8.2"
+  VERSION = "0.8.3"
 end