diff --git a/pkgs/applications/networking/gns3/server.nix b/pkgs/applications/networking/gns3/server.nix
index f3927d8cdd29..24e641abc826 100644
--- a/pkgs/applications/networking/gns3/server.nix
+++ b/pkgs/applications/networking/gns3/server.nix
@@ -4,7 +4,7 @@
 
 let
   pythonPackages = python36Packages;
-  async-timeout = (stdenv.lib.overrideDerivation pythonPackages.async-timeout
+  async-timeout = pythonPackages.async-timeout.overrideAttrs
     (oldAttrs:
       rec {
         pname = "async-timeout";
@@ -13,8 +13,8 @@ let
           inherit pname version;
           sha256 = "1l3kg062m02mph6rf9rdv8r5c5n356clxa6b6mrn0i77vk9g9kq0";
         };
-      }));
-  aiohttp = (stdenv.lib.overrideDerivation pythonPackages.aiohttp
+      });
+  aiohttp = pythonPackages.aiohttp.overrideAttrs
     (oldAttrs:
       rec {
         pname = "aiohttp";
@@ -25,8 +25,8 @@ let
         };
         propagatedBuildInputs = [ async-timeout ]
           ++ (with pythonPackages; [ attrs chardet multidict yarl idna-ssl ]);
-      }));
-  aiohttp-cors = (stdenv.lib.overrideDerivation pythonPackages.aiohttp-cors
+      });
+  aiohttp-cors = pythonPackages.aiohttp-cors.overrideAttrs
     (oldAttrs:
       rec {
         pname = "aiohttp-cors";
@@ -40,7 +40,7 @@ let
           ++ stdenv.lib.optional
                (pythonPackages.pythonOlder "3.5")
                pythonPackages.typing;
-      }));
+      });
 in pythonPackages.buildPythonPackage rec {
   name = "${pname}-${version}";
   pname = "gns3-server";