diff --git a/lib/xero-ruby/api_client.rb b/lib/xero-ruby/api_client.rb
index dc9d679a..cb98c7bb 100644
--- a/lib/xero-ruby/api_client.rb
+++ b/lib/xero-ruby/api_client.rb
@@ -226,7 +226,8 @@ def refresh_token_set(token_set)
     def revoke_token(token_set)
       token_set = token_set.with_indifferent_access
       data = {
-        token: token_set[:refresh_token]
+        token: token_set[:refresh_token],
+        token_type_hint: 'refresh_token'
       }
       return token_request(data, '/revocation')
     end
diff --git a/spec/api_client_spec.rb b/spec/api_client_spec.rb
index 617433b7..0f4ad221 100644
--- a/spec/api_client_spec.rb
+++ b/spec/api_client_spec.rb
@@ -137,6 +137,18 @@
       expect(api_client.refresh_token_set(token_set)).to eq(token_set)
     end
 
+    it "#revoke_token" do
+      expect(api_client).to receive(:token_request).with(
+        {
+          token: token_set[:refresh_token],
+          token_type_hint: 'refresh_token'
+        },
+        '/revocation'
+      ).and_return(token_set)
+
+      expect(api_client.revoke_token(token_set)).to eq(token_set)
+    end
+
     it "#connections" do
       expect(api_client).to receive(:call_api).and_return(connections)
       expect(api_client.config.base_url).to eq(nil)