diff --git a/.travis.yml b/.travis.yml
index fb752eda9..aa59761e6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,6 +13,7 @@ script: "rake spec:all"
 before_install:
  - sudo apt-get update
  - sudo apt-get install idn
+ - gem update bundler
 notifications:
   email:
     recipients:
diff --git a/lib/google/apis/core/http_command.rb b/lib/google/apis/core/http_command.rb
index 3b68b2ac5..0108a0b5d 100644
--- a/lib/google/apis/core/http_command.rb
+++ b/lib/google/apis/core/http_command.rb
@@ -144,7 +144,7 @@ module Google
         def prepare!
           header.update(options.header) if options && options.header
           self.url = url.expand(params) if url.is_a?(Addressable::Template)
-          url.query_values = query
+          url.query_values = query.merge(url.query_values || {})
         end
 
         # Release any resources used by this command
diff --git a/spec/google/apis/core/http_command_spec.rb b/spec/google/apis/core/http_command_spec.rb
index c9445f791..8543e7175 100644
--- a/spec/google/apis/core/http_command_spec.rb
+++ b/spec/google/apis/core/http_command_spec.rb
@@ -264,4 +264,12 @@ RSpec.describe Google::Apis::Core::HttpCommand do
     command.query['a'] = [1,2,3]
     command.execute(client)
   end
+
+  it 'should not remove initial query parameters' do
+    stub_request(:get, 'https://www.googleapis.com/zoo/animals?a=1&a=2&a=3&foo=bar')
+      .to_return(status: [200, ''])
+    command = Google::Apis::Core::HttpCommand.new(:get, 'https://www.googleapis.com/zoo/animals?foo=bar')
+    command.query['a'] = [1,2,3]
+    command.execute(client)
+  end
 end