diff --git a/Types/TrustLevel.hs b/Types/TrustLevel.hs
index 83e4e5a5ea..27325cd2bf 100644
--- a/Types/TrustLevel.hs
+++ b/Types/TrustLevel.hs
@@ -10,6 +10,7 @@ module Types.TrustLevel (
 	TrustMap,
 	readTrustLevel,
 	showTrustLevel,
+	prop_read_show_TrustLevel
 ) where
 
 import qualified Data.Map as M
@@ -17,7 +18,7 @@ import qualified Data.Map as M
 import Types.UUID
 
 data TrustLevel = Trusted | SemiTrusted | UnTrusted | DeadTrusted
-	deriving (Eq, Enum, Ord)
+	deriving (Eq, Enum, Ord, Bounded)
 
 type TrustMap = M.Map UUID TrustLevel
 
@@ -33,3 +34,8 @@ showTrustLevel Trusted = "trusted"
 showTrustLevel UnTrusted = "untrusted"
 showTrustLevel SemiTrusted = "semitrusted"
 showTrustLevel DeadTrusted = "dead"
+
+prop_read_show_TrustLevel :: Bool
+prop_read_show_TrustLevel = all check [minBound .. maxBound]
+  where
+	check l = readTrustLevel (showTrustLevel l) == Just l
diff --git a/test.hs b/test.hs
index 77cb0cd409..fb0cdfda58 100644
--- a/test.hs
+++ b/test.hs
@@ -31,6 +31,7 @@ import qualified Git.Filename
 import qualified Locations
 import qualified Types.KeySource
 import qualified Types.Backend
+import qualified Types.TrustLevel
 import qualified Types
 import qualified GitAnnex
 import qualified Logs.UUIDBased
@@ -118,6 +119,7 @@ quickcheck = TestLabel "quickcheck" $ TestList
 	, qctest "prop_read_write_transferinfo" Logs.Transfer.prop_read_write_transferinfo
 	, qctest "prop_read_show_direct" Annex.Content.Direct.prop_read_show_direct
 	, qctest "prop_parse_show_log" Logs.Presence.prop_parse_show_log
+	, qctest "prop_read_show_TrustLevel" Types.TrustLevel.prop_read_show_TrustLevel
 	]
 
 blackbox :: Test