diff --git a/lib/core/src/Cardano/Wallet/Primitive/Slotting.hs b/lib/core/src/Cardano/Wallet/Primitive/Slotting.hs
index 0c90e335434..80c07fb5f8f 100644
--- a/lib/core/src/Cardano/Wallet/Primitive/Slotting.hs
+++ b/lib/core/src/Cardano/Wallet/Primitive/Slotting.hs
@@ -42,7 +42,7 @@ module Cardano.Wallet.Primitive.Slotting
     , getCurrentTimeRelativeFromStart
 
       -- ** Running queries
-    , TimeInterpreter
+    , TimeInterpreter (..)
     , mkSingleEraInterpreter
     , mkTimeInterpreter
     , PastHorizonException (..)