diff --git a/hledger-lib/Hledger/Utils/Debug.hs b/hledger-lib/Hledger/Utils/Debug.hs
index 13be45e87..3da3daf9f 100644
--- a/hledger-lib/Hledger/Utils/Debug.hs
+++ b/hledger-lib/Hledger/Utils/Debug.hs
@@ -117,8 +117,8 @@ dbg9 = tracePrettyAt 9
 
 -- | Convenience aliases for tracePrettyAtIO.
 -- Like dbg, but convenient to insert in an IO monad.
-dbgIO :: (MonadIO m, Show a) => String -> a -> m ()
-dbgIO = tracePrettyAtIO 0
+dbg0IO :: (MonadIO m, Show a) => String -> a -> m ()
+dbg0IO = tracePrettyAtIO 0
 
 dbg1IO :: (MonadIO m, Show a) => String -> a -> m ()
 dbg1IO = tracePrettyAtIO 1