diff --git a/contrib/Makefile.am b/contrib/Makefile.am
index f9de7a75e..c38a1630f 100644
--- a/contrib/Makefile.am
+++ b/contrib/Makefile.am
@@ -1,7 +1,8 @@
 SUBDIRS = . tos pp
 
 bin_SCRIPTS = \
-  taler-bank-manage-testing
+  taler-bank-manage-testing \
+  taler-exchange-revoke
 
 EXTRA_DIST = \
   $(bin_SCRIPTS) \
diff --git a/contrib/taler-bank-manage-testing b/contrib/taler-bank-manage-testing
index b7e356d44..29494e3ad 100755
--- a/contrib/taler-bank-manage-testing
+++ b/contrib/taler-bank-manage-testing
@@ -10,6 +10,12 @@
 
 set -eu
 
+if [ "$#" -ne 3 ];
+then
+    echo "illegal number of parameters"
+    exit 1
+fi
+
 # Ensure starting accounts exist
 taler-bank-manage -c $1 --with-db $2 django provide_accounts
 taler-bank-manage -c $1 --with-db $2 django add_bank_account 42