diff --git a/Propellor.hs b/Propellor.hs
index 8b9b6ee..8b1016d 100644
--- a/Propellor.hs
+++ b/Propellor.hs
@@ -24,7 +24,6 @@ getProperties hostname@"clam.kitenet.net" =
 	-- Clam is a tor bridge.
 	, Tor.isBridge
 	-- I play with docker on clam.
-	, Apt.installed ["docker.io"]
 	, Docker.configured
 	-- This is not an important system so I don't want to need to 
 	-- manually upgrade it.
diff --git a/Property/Docker.hs b/Property/Docker.hs
index 9d01d0b..ebb3d3a 100644
--- a/Property/Docker.hs
+++ b/Property/Docker.hs
@@ -2,10 +2,15 @@ module Property.Docker where
 
 import Common
 import qualified Property.File as File
+import qualified Property.Apt as Apt
 
 {- Configures docker with an authentication file, so that images can be
  - pushed to index.docker.io. -}
 configured :: Property
-configured = Property "docker configured" $ 
-	withPrivData DockerAuthentication $ \cfg ->
-		ensureProperty $ "/root/.dockercfg" `File.hasContent` (lines cfg)
+configured = Property "docker configured" go `requires` installed
+  where
+	go = withPrivData DockerAuthentication $ \cfg -> ensureProperty $ 
+		"/root/.dockercfg" `File.hasContent` (lines cfg)
+	
+installed :: Property
+installed = Apt.installed ["docker.io"]