diff --git a/lib/tasks/mrsk/prune.rake b/lib/tasks/mrsk/prune.rake
index c6165fa2..fd9a2b58 100644
--- a/lib/tasks/mrsk/prune.rake
+++ b/lib/tasks/mrsk/prune.rake
@@ -1,5 +1,8 @@
 require_relative "setup"
 
+PRUNE_IMAGES_AFTER     = 30.days.in_hours.to_i
+PRUNE_CONTAINERS_AFTER = 3.days.in_hours.to_i
+
 namespace :mrsk do
   desc "Prune unused images and stopped containers"
   task prune: %w[ prune:containers prune:images ]
@@ -7,12 +10,12 @@ namespace :mrsk do
   namespace :prune do
     desc "Prune unused images older than 30 days"
     task :images do
-      on(MRSK_CONFIG.hosts) { execute "docker image prune -f --filter 'until=720h'" }
+      on(MRSK_CONFIG.hosts) { execute "docker image prune -f --filter 'until=#{PRUNE_IMAGES_AFTER}h'" }
     end
 
     desc "Prune stopped containers for the service older than 3 days"
     task :containers do
-      on(MRSK_CONFIG.hosts) { execute "docker container prune -f --filter label=service=#{MRSK_CONFIG.service} --filter 'until=72h'" }
+      on(MRSK_CONFIG.hosts) { execute "docker container prune -f --filter label=service=#{MRSK_CONFIG.service} --filter 'until=#{PRUNE_CONTAINERS_AFTER}h'" }
     end
   end
 end