diff --git a/NAudio/Wave/WaveStreams/AudioFileReader.cs b/NAudio/Wave/WaveStreams/AudioFileReader.cs
index c5c8a0ef..b1957b5c 100644
--- a/NAudio/Wave/WaveStreams/AudioFileReader.cs
+++ b/NAudio/Wave/WaveStreams/AudioFileReader.cs
@@ -57,7 +57,7 @@ private void CreateReaderStream(string fileName)
             {
                 readerStream = new Mp3FileReader(fileName);
             }
-            else if (fileName.EndsWith(".aiff"))
+            else if (fileName.EndsWith(".aiff", StringComparison.OrdinalIgnoreCase) || fileName.EndsWith(".aif", StringComparison.OrdinalIgnoreCase))
             {
                 readerStream = new AiffFileReader(fileName);
             }