diff --git a/winml/api/Windows.AI.MachineLearning.idl b/winml/api/Windows.AI.MachineLearning.idl
index 57a09cf662..2b55fa8c7a 100644
--- a/winml/api/Windows.AI.MachineLearning.idl
+++ b/winml/api/Windows.AI.MachineLearning.idl
@@ -412,8 +412,8 @@ namespace ROOT_NS.AI.MachineLearning
         Windows.Graphics.Imaging.BitmapAlphaMode BitmapAlphaMode{ get; };
         [contract(MachineLearningContract, 5)]
         {
-        	//！Specifies the nominal pixel range of pixel data.
-        	LearningModelPixelRange PixelRange{ get; };
+            //！Specifies the nominal pixel range of pixel data.
+            LearningModelPixelRange PixelRange{ get; };
         }
 
         //! The width of the image.
@@ -765,4 +765,4 @@ namespace ROOT_NS.AI.MachineLearning
         static ImageFeatureValue CreateFromVideoFrame(Windows.Media.VideoFrame image);
         Windows.Media.VideoFrame VideoFrame{ get; };
     }
-}
\ No newline at end of file
+}