diff --git a/tests/partmap_test.in b/tests/partmap_test.in
index e72af9ce4..0043bcf4c 100644
--- a/tests/partmap_test.in
+++ b/tests/partmap_test.in
@@ -43,7 +43,7 @@ check_output () {
     for dsk in $@; do
 	if ! grep "($dsk)" "${outfile}" >/dev/null
 	then
-	    echo "($dsk): disk/partiton not found"
+	    echo "($dsk): disk/partiton not found in: $(cat "${outfile}")"
 	    exit 1
 	fi
     done