diff --git a/tests/test.conf b/tests/test.conf
index d24224fb00..e0717f65db 100644
--- a/tests/test.conf
+++ b/tests/test.conf
@@ -57,7 +57,7 @@ FileMaxSize 100M
 
 # Fire up ffmpeg pointing at this stream
 
-Launch ../ffmpeg -loop -flags +bitexact -dct fastint -idct simple -y -f pgmyuv -i vsynth1/%02d.pgm
+Launch ../ffmpeg -loop_input -flags +bitexact -dct fastint -idct simple -y -f pgmyuv -i vsynth1/%02d.pgm
 acl allow localhost
 </Feed>