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-rw-r--r--src/Propellor/Property/Apt.hs4
1 files changed, 3 insertions, 1 deletions
diff --git a/src/Propellor/Property/Apt.hs b/src/Propellor/Property/Apt.hs
index 5630d83a..68ebe89e 100644
--- a/src/Propellor/Property/Apt.hs
+++ b/src/Propellor/Property/Apt.hs
@@ -331,7 +331,9 @@ isInstalled :: Package -> IO Bool
isInstalled p = isInstalled' [p]
isInstalled' :: [Package] -> IO Bool
-isInstalled' ps = all (== IsInstalled) <$> getInstallStatus ps
+isInstalled' ps = do
+ is <- getInstallStatus ps
+ return $ all (== IsInstalled) is && length is == length ps
data InstallStatus = IsInstalled | NotInstalled
deriving (Show, Eq)