diff --git a/src/accounts/account.form.tmpl.html b/src/accounts/account.form.tmpl.html
index 4f41685..2a11bb6 100644
--- a/src/accounts/account.form.tmpl.html
+++ b/src/accounts/account.form.tmpl.html
@@ -41,7 +41,8 @@
           <div class="input-group-addon">-</div>
           <input class="form-control" id="authorized-overdraft"
           name="authorized_overdraft"
-          ng-model="$ctrl.account.authorized_overdraft"
+          ng-model="$ctrl.authorized_overdraft"
+          ng-change="$ctrl.authorizedOverdraftChange()"
           type="number" placeholder="Authorized overdraft"
           required min="0"/>
           <div class="input-group-addon">.00€</div>
diff --git a/src/accounts/index.js b/src/accounts/index.js
index cea1456..1d82593 100644
--- a/src/accounts/index.js
+++ b/src/accounts/index.js
@@ -206,6 +206,11 @@ var accountModule = angular.module('accountant.accounts', [
 
         vm.$onInit = function() {
             vm.account = vm.resolve.account;
+            vm.authorized_overdraft = - vm.account.authorized_overdraft;
+        };
+
+        vm.authorizedOverdraftChange = function() {
+            vm.account.authorized_overdraft = - vm.authorized_overdraft;
         };
 
         vm.ok = function() {