diff --git a/plume-models/src/lib.rs b/plume-models/src/lib.rs
index 546d5997..3eface9f 100644
--- a/plume-models/src/lib.rs
+++ b/plume-models/src/lib.rs
@@ -166,6 +166,12 @@ impl From<request::Error> for Error {
     }
 }
 
+impl From<activitystreams::iri_string::validate::Error> for Error {
+    fn from(_err: activitystreams::iri_string::validate::Error) -> Error {
+        Error::InvalidValue
+    }
+}
+
 pub type Result<T> = std::result::Result<T, Error>;
 
 /// Adds a function to a model, that returns the first