diff --git a/servant-server/src/Servant/Server/Internal/Config.hs b/servant-server/src/Servant/Server/Internal/Config.hs
index 5eab9431..90d41555 100644
--- a/servant-server/src/Servant/Server/Internal/Config.hs
+++ b/servant-server/src/Servant/Server/Internal/Config.hs
@@ -40,7 +40,7 @@ instance OVERLAPPABLE_
          HasConfigEntry xs val => HasConfigEntry (notIt ': xs) val where
     getConfigEntry (_ :. xs) = getConfigEntry xs
 
-instance OVERLAPPABLE_
+instance OVERLAPPING_
          HasConfigEntry (val ': xs) val where
     getConfigEntry (x :. _) = x