diff --git a/test/jaccard/test-jaccard.sh b/test/jaccard/test-jaccard.sh
index aab8e4afd30a9d7c52e924e25526d2dfb84c4f4b..d2de0e4a8152f2520490895133782b9eaf2b18bf 100644
--- a/test/jaccard/test-jaccard.sh
+++ b/test/jaccard/test-jaccard.sh
@@ -53,7 +53,7 @@ echo "    jaccard.t05...\c"
 echo \
 "intersection	union	jaccard
 10	140	0.0714286" > exp
-cat a.bed | $BT jaccard -a a.bed -b b.bed > obs
+cat a.bed | $BT jaccard -a - -b b.bed > obs
 check obs exp
 rm obs exp