diff --git a/nixos/modules/services/networking/stunnel.nix b/nixos/modules/services/networking/stunnel.nix
index 70d0a7d3c12e..df4908a0fff9 100644
--- a/nixos/modules/services/networking/stunnel.nix
+++ b/nixos/modules/services/networking/stunnel.nix
@@ -25,8 +25,8 @@ let
       };
 
       connect = mkOption {
-        type = types.int;
-        description = "To which port the decrypted connection should be forwarded.";
+        type = types.either types.str types.int;
+        description = "Port or IP:Port to which the decrypted connection should be forwarded.";
       };
 
       cert = mkOption {