diff --git a/app/permissions/experiment.rb b/app/permissions/experiment.rb
index 4cf808cc0..7f06eac77 100644
--- a/app/permissions/experiment.rb
+++ b/app/permissions/experiment.rb
@@ -72,9 +72,9 @@ Canaid::Permissions.register_for(MyModule) do
   end
 
   # module: assign/unassign sample
+  # NOTE: Use 'module_page? &&' before calling this permission!
   can :assign_sample_to_module do |user, my_module|
-    module_page? &&
-      user.is_technician_or_higher_of_project?(my_module.experiment.project)
+    user.is_technician_or_higher_of_project?(my_module.experiment.project)
   end
 
   # module: complete/uncomplete
diff --git a/app/views/shared/_samples.html.erb b/app/views/shared/_samples.html.erb
index 4f1edf62e..c2888eae8 100644
--- a/app/views/shared/_samples.html.erb
+++ b/app/views/shared/_samples.html.erb
@@ -109,7 +109,7 @@
     </button>
   <% end %>
 
-  <% if can_assign_sample_to_module?(@my_module) %>
+  <% if module_page? && can_assign_sample_to_module?(@my_module) %>
     <button type="button" class="btn btn-default"
       id="assignSamples" onclick="$(this).next().click();" disabled>
       <span class="glyphicon glyphicon-ok-circle"></span>