diff --git a/x/ibc/applications/transfer/module.go b/x/ibc/applications/transfer/module.go
index 039597afe5..900526f583 100644
--- a/x/ibc/applications/transfer/module.go
+++ b/x/ibc/applications/transfer/module.go
@@ -379,7 +379,7 @@ func (am AppModule) OnAcknowledgementPacket(
 			sdk.NewAttribute(types.AttributeKeyReceiver, data.Receiver),
 			sdk.NewAttribute(types.AttributeKeyDenom, data.Denom),
 			sdk.NewAttribute(types.AttributeKeyAmount, fmt.Sprintf("%d", data.Amount)),
-			sdk.NewAttribute(types.AttributeKeyAck, fmt.Sprintf("%v", ack)),
+			sdk.NewAttribute(types.AttributeKeyAck, ack.String()),
 		),
 	)