diff --git a/scripts/echomix.sh b/scripts/echomix.sh
index 6ecfeb3..5d1aaae 100644
--- a/scripts/echomix.sh
+++ b/scripts/echomix.sh
@@ -26,9 +26,9 @@ for idx in $(seq 0 $NBRE)
 do
 	# build the two input filenames ...
 	#
-	imgA=$(printf "$SRCDIR/%04d.fimg" $idx)
+	imgA=$(printf "$SRCDIR/%05d.fimg" $idx)
 	vb=$(( $(( idx + OFFS )) % NBRE))
-	imgB=$(printf "$SRCDIR/%04d.fimg" $vb)
+	imgB=$(printf "$SRCDIR/%05d.fimg" $vb)
 
 	#	... and the output filename
 	#