diff --git a/bridgev2/matrix/provisioning.go b/bridgev2/matrix/provisioning.go
index 17e827e3..d95a9a6f 100644
--- a/bridgev2/matrix/provisioning.go
+++ b/bridgev2/matrix/provisioning.go
@@ -604,7 +604,7 @@ func RespondWithError(w http.ResponseWriter, err error, message string) {
 	if errors.As(err, &we) {
 		we.Write(w)
 	} else {
-		mautrix.MUnknown.WithMessage(message).Write(w)
+		mautrix.MUnknown.WithMessage("%s: %w", message, err).Write(w)
 	}
 }