diff --git a/src/Simplex/Messaging/Notifications/Server.hs b/src/Simplex/Messaging/Notifications/Server.hs
index f2ed2d6ea..54722601e 100644
--- a/src/Simplex/Messaging/Notifications/Server.hs
+++ b/src/Simplex/Messaging/Notifications/Server.hs
@@ -53,6 +53,7 @@ import Data.Time.Format.ISO8601 (iso8601Show)
 import GHC.IORef (atomicSwapIORef)
 import GHC.Stats (getRTSStats)
 import Network.Socket (ServiceName, Socket, socketToHandle)
+import Numeric.Natural (Natural)
 import Simplex.Messaging.Client (ProtocolClientError (..), SMPClientError, ServerTransmission (..))
 import Simplex.Messaging.Client.Agent
 import qualified Simplex.Messaging.Crypto as C