diff --git a/lib/schema_plus/core/schema_dump.rb b/lib/schema_plus/core/schema_dump.rb
index e4c0db2..65f5889 100644
--- a/lib/schema_plus/core/schema_dump.rb
+++ b/lib/schema_plus/core/schema_dump.rb
@@ -105,6 +105,13 @@ def assemble(stream, typelen, namelen)
               pr += ',' unless options.blank?
               stream.write "%-#{namelen+3}s " % pr
             end
+            if Gem::Version.new(::ActiveRecord::VERSION::STRING) >= Gem::Version.new('5.0.0')
+              if options[:default].is_a?(Proc) && 
+                default = options.delete(:default)
+                stream.write "default: -> { \"#{default.call}\" }"
+                stream.write ", " unless options.blank?
+              end
+            end
             stream.write options.to_s.sub(/^{(.*)}$/, '\1') unless options.blank?
             stream.write ' ' unless options.blank? or comments.blank?
             stream.write '# ' + comments.join('; ') unless comments.blank?