diff --git a/lib/train/platforms/detect/helpers/os_common.rb b/lib/train/platforms/detect/helpers/os_common.rb
index ae659858..88af6dad 100644
--- a/lib/train/platforms/detect/helpers/os_common.rb
+++ b/lib/train/platforms/detect/helpers/os_common.rb
@@ -89,7 +89,7 @@ def unix_uuid
       (unix_uuid_from_chef         ||
        unix_uuid_from_machine_file ||
        uuid_from_command           ||
-       raise(Train::TransportError, 'Cannot find a UUID for your node.'))
+       raise(Train::TransportError, "Cannot find a UUID for your node."))
     end
 
     def unix_uuid_from_chef
diff --git a/test/unit/transports/winrm_test.rb b/test/unit/transports/winrm_test.rb
index 6b3c3727..fa30f42d 100644
--- a/test/unit/transports/winrm_test.rb
+++ b/test/unit/transports/winrm_test.rb
@@ -28,7 +28,7 @@
       winrm.options[:host].must_equal "dummy"
     end
 
-    it 'has default endpoint' do
+    it "has default endpoint" do
       winrm.options[:endpoint].must_be_nil
     end
 
@@ -86,7 +86,7 @@
 
   end
 
-  describe 'when configuring the connection' do
+  describe "when configuring the connection" do
     let(:winrm) do
       cls.new(conf)
     end