diff --git a/src/Control/Monad/Trace.hs b/src/Control/Monad/Trace.hs
index 4368050..d5e63ba 100644
--- a/src/Control/Monad/Trace.hs
+++ b/src/Control/Monad/Trace.hs
@@ -9,7 +9,7 @@
 module Control.Monad.Trace (
   -- * Tracers
   Tracer, newTracer,
-  runTraceT, runTraceT', TraceT,
+  runTraceT, runTraceT', TraceT(..),
 
   -- * Collected data
   -- | Tracers currently expose two pieces of data: completed spans and pending span count. Note