diff --git a/lib/mrsk/commands/prune.rb b/lib/mrsk/commands/prune.rb
index c7e9b526..5d3d2320 100644
--- a/lib/mrsk/commands/prune.rb
+++ b/lib/mrsk/commands/prune.rb
@@ -11,6 +11,6 @@ class Mrsk::Commands::Prune < Mrsk::Commands::Base
 
   def containers
     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'"
+    docker :container, :prune, "--force", "--filter", "label=service=#{config.service}", "--filter", "until=#{PRUNE_CONTAINERS_AFTER}h"
   end
 end
diff --git a/test/commands/prune_test.rb b/test/commands/prune_test.rb
index 67abb81a..cda5c75a 100644
--- a/test/commands/prune_test.rb
+++ b/test/commands/prune_test.rb
@@ -16,8 +16,8 @@ class CommandsPruneTest < ActiveSupport::TestCase
 
   test "containers" do
     assert_equal \
-      "docker image prune --force --filter until=168h",
-      new_command.images.join(" ")
+      "docker container prune --force --filter label=service=app --filter until=72h",
+      new_command.containers.join(" ")
   end
 
   private