diff --git a/lib/tasks/data/truncate_data.rake b/lib/tasks/data/truncate_data.rake
index dce1476e69..da4a63674a 100644
--- a/lib/tasks/data/truncate_data.rake
+++ b/lib/tasks/data/truncate_data.rake
@@ -28,8 +28,7 @@ namespace :ofn do
     task :truncate, [:months_to_keep] => :environment do |_task, args|
       warn_with_confirmation
 
-      months_to_keep = args.months_to_keep.to_i
-      TruncateData.new(months_to_keep).call
+      TruncateData.new(args.months_to_keep).call
     end
 
     def warn_with_confirmation
diff --git a/lib/tasks/data/truncate_data.rb b/lib/tasks/data/truncate_data.rb
index 2e9a703535..56645eea3e 100644
--- a/lib/tasks/data/truncate_data.rb
+++ b/lib/tasks/data/truncate_data.rb
@@ -8,7 +8,7 @@ class TruncateData
   end
 
   def initialize(months_to_keep = nil)
-    @date = (months_to_keep || 3).months.ago
+    @date = (months_to_keep || 3).to_i.months.ago
   end
 
   def call