diff --git a/app/controllers/diary_entry_controller.rb b/app/controllers/diary_entry_controller.rb
index 90a08615c..bd2e45143 100644
--- a/app/controllers/diary_entry_controller.rb
+++ b/app/controllers/diary_entry_controller.rb
@@ -70,7 +70,7 @@ class DiaryEntryController < ApplicationController
       end
 
       # Add the commenter to the subscribers if necessary
-      @entry.subscriptions.create(user: @user) unless @entry.subscribers.exists?(@user)
+      @entry.subscriptions.create(user: @user) unless @entry.subscribers.exists?(@user.id)
 
       redirect_to :controller => "diary_entry", :action => "view", :display_name => @entry.user.display_name, :id => @entry.id
     else
@@ -83,7 +83,7 @@ class DiaryEntryController < ApplicationController
   def subscribe
     diary_entry = DiaryEntry.find(params[:id])
 
-    diary_entry.subscriptions.create(user: @user) unless diary_entry.subscribers.exists?(@user)
+    diary_entry.subscriptions.create(user: @user) unless diary_entry.subscribers.exists?(@user.id)
 
     redirect_to :controller => "diary_entry", :action => "view", :display_name => diary_entry.user.display_name, :id => diary_entry.id
   rescue ActiveRecord::RecordNotFound
@@ -93,7 +93,7 @@ class DiaryEntryController < ApplicationController
   def unsubscribe
     diary_entry = DiaryEntry.find(params[:id])
 
-    diary_entry.subscriptions.where(user: @user).delete_all if diary_entry.subscribers.exists?(@user)
+    diary_entry.subscriptions.where(user: @user).delete_all if diary_entry.subscribers.exists?(@user.id)
 
     redirect_to :controller => "diary_entry", :action => "view", :display_name => diary_entry.user.display_name, :id => diary_entry.id
   rescue ActiveRecord::RecordNotFound
diff --git a/app/views/diary_entry/view.html.erb b/app/views/diary_entry/view.html.erb
index 67ca96e72..3e9686922 100644
--- a/app/views/diary_entry/view.html.erb
+++ b/app/views/diary_entry/view.html.erb
@@ -21,7 +21,7 @@
     <%= richtext_area :diary_comment, :body, :cols => 80, :rows => 15 %>
     <%= submit_tag t('diary_entry.view.save_button') %>
   <% end %>
-  <% if @user and @entry.subscribers and @entry.subscribers.exists?(@user) %>
+  <% if @user and @entry.subscribers and @entry.subscribers.exists?(@user.id) %>
     <div style='position:relative; top: -30px; left: 130px'><%= link_to t('javascripts.changesets.show.unsubscribe'), diary_entry_unsubscribe_path(:display_name => @entry.user.display_name, :id => @entry.id), :method => :post, :class => :button %></div>
   <% elsif @user %>
     <div style='position:relative; top: -30px; left: 130px'><%= link_to t('javascripts.changesets.show.subscribe'), diary_entry_subscribe_path(:display_name => @entry.user.display_name, :id => @entry.id), :method => :post, :class => :button %></div>
diff --git a/test/controllers/diary_entry_controller_test.rb b/test/controllers/diary_entry_controller_test.rb
index cbe72a6df..91131ee8d 100644
--- a/test/controllers/diary_entry_controller_test.rb
+++ b/test/controllers/diary_entry_controller_test.rb
@@ -330,6 +330,8 @@ class DiaryEntryControllerTest < ActionController::TestCase
       assert_select "h2", :text => "No entry with the id: 9999", :count => 1
     end
 
+    post :subscribe, {:id => entry.id, :display_name => entry.user.display_name}, { :user => users(:normal_user).id}
+
     # Now try an invalid comment with an empty body
     assert_no_difference "ActionMailer::Base.deliveries.size" do
       assert_no_difference "DiaryComment.count" do
@@ -353,7 +355,7 @@ class DiaryEntryControllerTest < ActionController::TestCase
     assert_redirected_to :action => :view, :display_name => entry.user.display_name, :id => entry.id
     email = ActionMailer::Base.deliveries.first
     assert_equal [users(:normal_user).email], email.to
-    assert_equal "[OpenStreetMap] #{users(:public_user).display_name} commented on your diary entry", email.subject
+    assert_equal "[OpenStreetMap] #{users(:public_user).display_name} commented on a diary entry", email.subject
     assert_match /New comment/, email.text_part.decoded
     assert_match /New comment/, email.html_part.decoded
     ActionMailer::Base.deliveries.clear
@@ -376,6 +378,7 @@ class DiaryEntryControllerTest < ActionController::TestCase
   def test_comment_spammy
     # Find the entry to comment on
     entry = create(:diary_entry, :user_id => users(:normal_user).id)
+    post :subscribe, {:id => entry.id, :display_name => entry.user.display_name}, { :user => users(:normal_user).id}
 
     # Generate some spammy content
     spammy_text = 1.upto(50).map { |n| "http://example.com/spam#{n}" }.join(" ")
@@ -390,7 +393,7 @@ class DiaryEntryControllerTest < ActionController::TestCase
     assert_redirected_to :action => :view, :display_name => entry.user.display_name, :id => entry.id
     email = ActionMailer::Base.deliveries.first
     assert_equal [users(:normal_user).email], email.to
-    assert_equal "[OpenStreetMap] #{users(:public_user).display_name} commented on your diary entry", email.subject
+    assert_equal "[OpenStreetMap] #{users(:public_user).display_name} commented on a diary entry", email.subject
     assert_match %r{http://example.com/spam}, email.text_part.decoded
     assert_match %r{http://example.com/spam}, email.html_part.decoded
     ActionMailer::Base.deliveries.clear
@@ -699,11 +702,6 @@ class DiaryEntryControllerTest < ActionController::TestCase
   def test_unsubscribe_success
     diary_entry = create(:diary_entry, :user_id => users(:normal_user).id)
 
-    assert_difference "diary_entry.subscribers.count", -1 do
-      post :unsubscribe, {:id => diary_entry.id, :display_name => diary_entry.user.display_name}, { :user => users(:normal_user).id}
-    end
-    assert_response :redirect
-
     post :subscribe, {:id => diary_entry.id, :display_name => diary_entry.user.display_name}, { :user => users(:public_user).id}
     assert_difference "diary_entry.subscribers.count", -1 do
       post :unsubscribe, {:id => diary_entry.id, :display_name => diary_entry.user.display_name}, { :user => users(:public_user).id}