diff --git a/lib/puppet/type/nova_flavor.rb b/lib/puppet/type/nova_flavor.rb
index 1684e62e9..74592fdbd 100644
--- a/lib/puppet/type/nova_flavor.rb
+++ b/lib/puppet/type/nova_flavor.rb
@@ -119,18 +119,14 @@ Puppet::Type.newtype(:nova_flavor) do
   newproperty(:is_public) do
     desc "Whether the flavor is public or not. Default true"
     newvalues(/(y|Y)es/, /(n|N)o/, /(t|T)rue/, /(f|F)alse/, true, false)
-    defaultto(true)
-    munge do |v|
-      if v.is_a?(String)
-        if v =~ /^(y|Y)es$/
-          :true
-        elsif v =~ /^(n|N)o$/
-          :false
-        else
-          v.to_s.downcase.to_sym
-        end
+    defaultto(:true)
+
+    munge do |value|
+      case value.to_s.downcase
+      when 'true', 'yes'
+        :true
       else
-        v.to_s.downcase.to_sym
+        :false
       end
     end
   end