diff --git a/Database/Persist/Postgresql.hs b/Database/Persist/Postgresql.hs
--- a/Database/Persist/Postgresql.hs
+++ b/Database/Persist/Postgresql.hs
@@ -381,7 +381,7 @@
             Nothing -> AddUniqueConstraint name cols : getAltersU news old
             Just ocols ->
                 let old' = filter (\(x, _) -> x /= name) old
-                 in if sort cols == ocols
+                 in if sort cols == sort ocols
                         then getAltersU news old'
                         else  DropConstraint name
                             : AddUniqueConstraint name cols
diff --git a/persistent-postgresql.cabal b/persistent-postgresql.cabal
--- a/persistent-postgresql.cabal
+++ b/persistent-postgresql.cabal
@@ -1,5 +1,5 @@
 name:            persistent-postgresql
-version:         1.1.3
+version:         1.1.3.1
 license:         MIT
 license-file:    LICENSE
 author:          Felipe Lessa, Michael Snoyman <michael@snoyman.com>