diff --git a/lib/mrsk/commands/prune.rb b/lib/mrsk/commands/prune.rb
index 9ce5645e..db1fc62c 100644
--- a/lib/mrsk/commands/prune.rb
+++ b/lib/mrsk/commands/prune.rb
@@ -6,11 +6,11 @@ class Mrsk::Commands::Prune < Mrsk::Commands::Base
   PRUNE_CONTAINERS_AFTER = 3.days.in_hours.to_i
 
   def images
-    docker :image, :prune, "-f", "--filter", "until=#{PRUNE_IMAGES_AFTER}h"
+    docker :image, :prune, "--force", "--filter", "until=#{PRUNE_IMAGES_AFTER}h"
   end
 
   def containers
-    docker :image, :prune, "-f", "--filter", "until=#{PRUNE_IMAGES_AFTER}h"
-    docker :container, :prune, "-f", "--filter", "label=service=#{config.service}", "--filter", "'until=#{PRUNE_CONTAINERS_AFTER}h'"
+    docker :image, :prune, "--force", "--filter", "until=#{PRUNE_IMAGES_AFTER}h"
+    docker :container, :prune, "--force", "--filter", "label=service=#{config.service}", "--filter", "'until=#{PRUNE_CONTAINERS_AFTER}h'"
   end
 end