diff --git a/debian/control b/debian/control
index 4519c8cf4..8ea436dfa 100644
--- a/debian/control
+++ b/debian/control
@@ -6,6 +6,7 @@ Build-Depends:
  autoconf (>=2.59),
  automake (>=1.11.1),
  autopoint,
+ bash,
  debhelper-compat (= 13),
  gettext,
  libgnunet-dev,
diff --git a/debian/taler-exchange.postinst b/debian/taler-exchange.postinst
index 901f768a5..1c776c7ef 100644
--- a/debian/taler-exchange.postinst
+++ b/debian/taler-exchange.postinst
@@ -14,9 +14,12 @@ function fixperm() {
 
 # usage: lncfg user home target
 function lncfg() {
-  mkdir $TALER_HOME/$2/.config
-  chown $1:$1 $TALER_HOME/$2/.config
-  ln -sf $TALER_HOME/$2/.config/taler.conf $3
+  local cf=$TALER_HOME/$2/.config
+  if [ ! -e $cf ]; then
+    mkdir $cf
+    chown $1:$1 $cf
+  fi
+  ln -sf $cf/taler.conf $3
 }
 
 case "${1}" in