diff --git a/views/setup.html b/views/setup.html
index 4072c14a1..1a4775a5b 100644
--- a/views/setup.html
+++ b/views/setup.html
@@ -54,7 +54,7 @@
               </div>
               <div class="large-6 medium-6 columns">
                 <label>Select required signatures (*)
-                  <select ng-model="requiredCopayers" ng-options="requiredCopayers as requiredCopayers for requiredCopayers in RCValues">
+                  <select ng-model="requiredCopayers" ng-options="requiredCopayers as requiredCopayers for requiredCopayers in RCValues" ng-disabled="totalCopayers == 1">
                   </select>
                 </label>
               </div>