diff --git a/src/ImageSharp/Formats/Png/PngChunkType.cs b/src/ImageSharp/Formats/Png/PngChunkType.cs
index 67e5ccf55..015f6984d 100644
--- a/src/ImageSharp/Formats/Png/PngChunkType.cs
+++ b/src/ImageSharp/Formats/Png/PngChunkType.cs
@@ -125,6 +125,6 @@ namespace SixLabors.ImageSharp.Formats.Png
         /// Malformed chunk named CgBI produced by apple, which is not conform to the specification.
         /// Related issue is here https://github.com/SixLabors/ImageSharp/issues/410
         /// </summary>
-        MalformedApple = 0x43674249
+        ProprietaryApple = 0x43674249
     }
 }
diff --git a/src/ImageSharp/Formats/Png/PngDecoderCore.cs b/src/ImageSharp/Formats/Png/PngDecoderCore.cs
index 757b08481..0247dba35 100644
--- a/src/ImageSharp/Formats/Png/PngDecoderCore.cs
+++ b/src/ImageSharp/Formats/Png/PngDecoderCore.cs
@@ -215,8 +215,8 @@ namespace SixLabors.ImageSharp.Formats.Png
                             case PngChunkType.End:
                                 this.isEndChunkReached = true;
                                 break;
-                            case PngChunkType.MalformedApple:
-                                PngThrowHelper.ThrowInvalidChunkType("Malformed Apple PNG detected! This PNG file is not conform to the specification and cannot be decoded.");
+                            case PngChunkType.ProprietaryApple:
+                                PngThrowHelper.ThrowInvalidChunkType("Proprietary Apple PNG detected! This PNG file is not conform to the specification and cannot be decoded.");
                                 break;
                         }
                     }