diff --git a/tests/fate-run.sh b/tests/fate-run.sh
index b19f0aeba4..39db0e89e0 100755
--- a/tests/fate-run.sh
+++ b/tests/fate-run.sh
@@ -91,7 +91,7 @@ enc_dec_pcm(){
     encfile="${outdir}/${test}.${out_fmt}"
     cleanfiles=$encfile
     avconv -i $ref "$@" -f $out_fmt -y ${target_path}/${encfile} || return
-    avconv -i ${target_path}/${encfile} -c:a pcm_${pcm_fmt} -f wav -
+    avconv -f $out_fmt -i ${target_path}/${encfile} -c:a pcm_${pcm_fmt} -f wav -
 }
 
 regtest(){