diff --git a/Remote/S3.hs b/Remote/S3.hs
index 9563b5a0fa..2b7c58e6fc 100644
--- a/Remote/S3.hs
+++ b/Remote/S3.hs
@@ -52,6 +52,7 @@ import Utility.Url (checkBoth, managerSettings, closeManager)
 #if MIN_VERSION_http_client(0,5,0)
 import Network.HTTP.Client (responseTimeoutNone)
 #else
+responseTimeoutNone :: Maybe Int
 responseTimeoutNone = Nothing
 #endif