diff --git a/lib.nix b/lib.nix
index cb43efa..b4b47a4 100644
--- a/lib.nix
+++ b/lib.nix
@@ -21,7 +21,7 @@ let
 
   getHostIpv4 = hostname: (getHostNetworkSettings hostname).ipv4-address;
   getHostIpv6 = hostname: (getHostNetworkSettings hostname).ipv6-address;
-  getHostIps =
+  getHostIps = hostname:
     filter (o: o != null) [ (getHostIpv4 hostname) (getHostIpv6 hostname) ];
 
 in {