diff --git a/play-test.rkt b/play-test.rkt
index 93502b9..bc7f057 100644
--- a/play-test.rkt
+++ b/play-test.rkt
@@ -16,8 +16,8 @@
 (define test-file3-id 3)
 (define test-file4-id 4)
 
-(set! test-file3 (build-path tests "idyll.mp3"))
-(set! test-file4 (build-path tests "idyll.flac"))
+(set! test-file3 (build-path tests "idyll.flac"))
+(set! test-file4 (build-path tests "idyll.mp3"))
 
 ;(define fmt (ao-mk-format 24 48000 2 'big-endian))
 ;(define ao-h (ao-open-live #f fmt))