diff --git a/lib/Properties.hs b/lib/Properties.hs
index f142493f5ba2bf22f3bb82338b3898f1afa0e655..b2d4974c41d8a50e4fccb48a3ca77c1616560f42 100644
--- a/lib/Properties.hs
+++ b/lib/Properties.hs
@@ -706,7 +706,7 @@ unwrapURI sym p@(Property name _) f g = unwrapString p $ \link -> do
       DomainDoesNotExist domain -> "The domain " <> domain <> " does not exist; \
                                    \please make sure it is spelled correctly."
       SchemaDoesNotExist schema ->
-        "the URI schema " <> schema <> ":// does not exist."
+        "the URI schema " <> schema <> ":// cannot be used."
       WrongScope schema allowed ->
         "the URI schema " <> schema <> ":// cannot be used in property \
         \\"" <> name <> "\"; allowed "