diff --git a/paris-container.nix b/paris-container.nix
index 7fa11f8..0ccf1d4 100644
--- a/paris-container.nix
+++ b/paris-container.nix
@@ -43,7 +43,7 @@ in {
       };
 
       listen-ips = mkOption {
-        type = str;
+        type = listOf str;
         description = "Address on which to listen for requests.";
       };