diff --git a/src/Quasar/Observable.hs b/src/Quasar/Observable.hs
index 2ae6c47af38f8829cb67586557e0c2ea38c8b3c3..67c2563087dc113cb109beec83489d52a96ae97c 100644
--- a/src/Quasar/Observable.hs
+++ b/src/Quasar/Observable.hs
@@ -1,6 +1,6 @@
 module Quasar.Observable (
   -- * Observable core
-  Observable(..),
+  Observable,
   ObservableState(..),
   IsRetrievable(..),
   IsObservable(..),