diff --git a/app/models/statistics.rb b/app/models/statistics.rb
index 6878e5ae0e..6f252ac8b4 100644
--- a/app/models/statistics.rb
+++ b/app/models/statistics.rb
@@ -129,6 +129,8 @@ def by_week_to_today_with_noughts(counts_by_week, start_date)
       earliest_week = start_date.to_date.at_beginning_of_week
       latest_week = Date.current.at_beginning_of_week
 
+      counts_by_week.map! { |date, count| [date.to_s, count] }
+
       (earliest_week..latest_week).step(7) do |date|
         counts_by_week << [date.to_s, 0] unless counts_by_week.any? { |c| c.first == date.to_s }
       end
diff --git a/config/initializers/alaveteli.rb b/config/initializers/alaveteli.rb
index 58dab0fda2..d0ae6eed40 100644
--- a/config/initializers/alaveteli.rb
+++ b/config/initializers/alaveteli.rb
@@ -11,7 +11,7 @@
 load "util.rb"
 
 # Application version
-ALAVETELI_VERSION = '0.28.0.4'
+ALAVETELI_VERSION = '0.28.0.5'
 
 # Add new inflection rules using the following format
 # (all these examples are active by default):
diff --git a/doc/CHANGES.md b/doc/CHANGES.md
index ed92033e30..216d799c42 100644
--- a/doc/CHANGES.md
+++ b/doc/CHANGES.md
@@ -1,3 +1,10 @@
+# 0.28.0.5
+
+# Highlighted Features
+
+* Fix bug in `Statistics.by_week_to_today_with_noughts` causing comparisons to
+  fail (Gareth Rees)
+
 # 0.28.0.4
 
 # Highlighted Features
diff --git a/spec/models/statistics_spec.rb b/spec/models/statistics_spec.rb
index e2323395dd..b5022dc387 100644
--- a/spec/models/statistics_spec.rb
+++ b/spec/models/statistics_spec.rb
@@ -123,8 +123,8 @@
   describe ".by_week_to_today_with_noughts" do
     it "adds missing weeks with noughts" do
       data = [
-        ["2016-01-04", 2],
-        ["2016-01-18", 1]
+        [Date.parse("2016-01-04"), 2],
+        [Date.parse("2016-01-18"), 1]
       ]
       date_from = Date.new(2015, 12, 28)
       fake_current_date = Date.new(2016, 1, 31)