diff --git a/.travis.yml b/.travis.yml
index 06bf19c..3b1da1b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,5 @@
 sudo: false
 language: ruby
 rvm:
-  - 2.4.2
+  - 2.6.0
 before_install: gem install bundler -v 1.16.1
diff --git a/lib/bitcoiner/client.rb b/lib/bitcoiner/client.rb
index cfcbca1..f255324 100644
--- a/lib/bitcoiner/client.rb
+++ b/lib/bitcoiner/client.rb
@@ -71,10 +71,11 @@ def parse_body(response)
       if response.success?
         JSON.parse(response.body)
       else
-        error_message = %i[code return_code].map do |attr|
-          "#{attr}: `#{response.send(attr)}`"
-        end.join(', ')
-        raise JSONRPCError, "unsuccessful response; #{error_message}"
+        error_messages = %i[code return_code].each_with_object({}) do |attr, hash|
+          hash[attr] = response.send(attr)
+        end
+        error_messages[:body] = response.body
+        raise JSONRPCError, error_messages.map {|k, v| "#{k}: `#{v}`"}.join("; ")
       end
     end
   end
diff --git a/test/client_test.rb b/test/client_test.rb
index 0ed920f..c700a43 100644
--- a/test/client_test.rb
+++ b/test/client_test.rb
@@ -64,8 +64,11 @@ class ClientTest < Minitest::Test
     context 'response is not successful' do
       setup do
         response = Typhoeus::Response.new(
-          code: 0,
-          return_code: :couldnt_connect
+          code: 500,
+          return_code: :ok,
+          # response supposedly includes body
+          # https://github.com/bitcoin/bitcoin/issues/12673#issuecomment-372334718
+          body: {some: "body"}.to_json,
         )
         Typhoeus.stub('http://127.0.0.1:8332', userpwd: "testuser:testpass").
           and_return(response)
@@ -76,12 +79,16 @@ class ClientTest < Minitest::Test
       end
 
       should 'raise JSONRPCError' do
-        assert_raises(
-          Bitcoiner::Client::JSONRPCError,
-          'unsuccessful response; code: `0`, return_code: `couldnt_connect`'
-        ) do
+        error = assert_raises(Bitcoiner::Client::JSONRPCError) do
           @bcd.request('listtransactions')
         end
+
+        expected_error_message = [
+          'code: `500`',
+          'return_code: `ok`',
+          'body: `{"some":"body"}`',
+        ].join("; ")
+        assert_equal expected_error_message, error.message
       end
     end