diff --git a/app/views/timesheet/_overhead_form.html.erb b/app/views/timesheet/_overhead_form.html.erb
index b51064a..922bbd7 100644
--- a/app/views/timesheet/_overhead_form.html.erb
+++ b/app/views/timesheet/_overhead_form.html.erb
@@ -3,6 +3,8 @@
     <%= l(:overhead_field_billing_status) %>
   </label>
   <br />
-  <%= select_tag('timesheet[billable][]','', {:multiple => true, :size => list_size}) %>
+  <%= select_tag('timesheet[billable][]',
+                 options_for_select(billable_values),
+                 {:multiple => true, :size => list_size}) %>
 
 </p>
diff --git a/lib/overhead_timesheet_hook.rb b/lib/overhead_timesheet_hook.rb
index d8bc160..3593f79 100644
--- a/lib/overhead_timesheet_hook.rb
+++ b/lib/overhead_timesheet_hook.rb
@@ -1,4 +1,5 @@
 class OverheadTimesheetHook < Redmine::Hook::ViewListener
+  include OverheadHelper
 
   # Adds a table header "Billable" to the report results
   def plugin_timesheet_views_timesheet_group_header(context={})
@@ -22,11 +23,13 @@ class OverheadTimesheetHook < Redmine::Hook::ViewListener
 
   # Added a new field for filtering based on "billable?"
   def plugin_timesheet_views_timesheet_form(context={})
+    billable_values = select_values_for_field(TimeEntryActivity.billable_custom_field)
     context[:controller].send(:render_to_string,
                               :partial => 'timesheet/overhead_form',
                               :layout => false,
                               :locals => {
-                                :list_size => context[:list_size] || 5
+                                :list_size => context[:list_size] || 5,
+                                :billable_values => billable_values
                               })
   end
 end
diff --git a/spec/lib/overhead_timesheet_hook_spec.rb b/spec/lib/overhead_timesheet_hook_spec.rb
index af59514..44cc691 100644
--- a/spec/lib/overhead_timesheet_hook_spec.rb
+++ b/spec/lib/overhead_timesheet_hook_spec.rb
@@ -63,5 +63,19 @@ describe OverheadTimesheetHook, "#plugin_timesheet_views_timesheet_form", :type
     response.should have_tag('select[name=?][multiple=multiple]', 'timesheet[billable][]')
   end
 
+  it 'should populate the select field with the possible options of the custom data field' do
+    @custom_field = mock_model(TimeEntryActivityCustomField,
+                               :possible_values => ['A','B','Nil'],
+                               :field_format => 'list')
+    TimeEntryActivity.should_receive(:billable_custom_field).and_return(@custom_field)
+    
+    response = call_hook(:plugin_timesheet_views_timesheet_form, {})
+    response.should have_tag('select') do
+      with_tag('option[value=?]','A','A')
+      with_tag('option[value=?]','B','B')
+      with_tag('option[value=?]','Nil','none')
+    end
+  end
+  
   it 'should pre-select the values from the submission'
 end