diff --git a/app/views/projects/calendar.rhtml b/app/views/projects/calendar.rhtml
index 743721c..048d8a5 100644
--- a/app/views/projects/calendar.rhtml
+++ b/app/views/projects/calendar.rhtml
@@ -23,7 +23,7 @@
 <% content_for :sidebar do %>
     <h3><%= l(:label_calendar) %></h3>
     
-    <% form_tag() do %>
+    <% form_tag({}, :method => :get) do %>
     <p><%= select_month(@month, :prefix => "month", :discard_type => true) %>
     <%= select_year(@year, :prefix => "year", :discard_type => true) %></p>
     
diff --git a/app/views/projects/gantt.rhtml b/app/views/projects/gantt.rhtml
index d941d27..f398bac 100644
--- a/app/views/projects/gantt.rhtml
+++ b/app/views/projects/gantt.rhtml
@@ -235,7 +235,7 @@ if Date.today >= @date_from and Date.today <= @date_to %>
 
 <% content_for :sidebar do %>
     <h3><%= l(:label_gantt) %></h3>
-    <% form_tag(params.merge(:tracker_ids => nil, :with_subprojects => nil)) do %>
+    <% form_tag(params.merge(:tracker_ids => nil, :with_subprojects => nil), :method => :get) do %>
     <% @trackers.each do |tracker| %>
       <label><%= check_box_tag "tracker_ids[]", tracker.id, (@selected_tracker_ids.include? tracker.id.to_s) %> <%= tracker.name %></label><br />
     <% end %>
@@ -243,7 +243,7 @@ if Date.today >= @date_from and Date.today <= @date_to %>
     <br /><label><%= check_box_tag 'with_subprojects', 1, @with_subprojects %> <%=l(:label_subproject_plural)%></label>
     <%= hidden_field_tag 'with_subprojects', 0 %>
     <% end %>
-    <p><%= submit_tag l(:button_apply), :class => 'button-small' %></p>
+    <p><%= submit_tag l(:button_apply), :class => 'button-small', :name => nil %></p>
     <% end %>
 <% end %>
 
diff --git a/app/views/projects/roadmap.rhtml b/app/views/projects/roadmap.rhtml
index d9329d1..ba0bb3e 100644
--- a/app/views/projects/roadmap.rhtml
+++ b/app/views/projects/roadmap.rhtml
@@ -30,7 +30,7 @@
 <% end %>
 
 <% content_for :sidebar do %>
-<% form_tag do %>
+<% form_tag({}, :method => :get) do %>
 <h3><%= l(:label_roadmap) %></h3>
 <% @trackers.each do |tracker| %>
   <label><%= check_box_tag "tracker_ids[]", tracker.id, (@selected_tracker_ids.include? tracker.id.to_s), :id => nil %>
@@ -38,7 +38,7 @@
 <% end %>
 <br />
 <label for="completed"><%= check_box_tag "completed", 1, params[:completed] %> <%= l(:label_show_completed_versions) %></label>
-<p><%= submit_tag l(:button_apply), :class => 'button-small' %></p>
+<p><%= submit_tag l(:button_apply), :class => 'button-small', :name => nil %></p>
 <% end %>
 
 <h3><%= l(:label_version_plural) %></h3>