diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 97487d237e0..784765bec98 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -315,6 +315,31 @@ in {
     };
   };
 
+  aiohttp-cors = buildPythonPackage rec {
+    name = "${pname}-${version}";
+    pname = "aiohttp-cors";
+    # 0.5.3 is the current version but gns3-server requires 0.5.1
+    version = "0.5.1";
+
+    src = pkgs.fetchurl {
+      url = "mirror://pypi/a/${pname}/${name}.tar.gz";
+      sha256 = "0szma27ri25fq4nwwvs36myddggw3jz4pyzmq63yz4xpw0jjdxck";
+    };
+
+    # Requires network access
+    doCheck = false;
+
+    propagatedBuildInputs = with self; [ zodb3 aiohttp ]
+      ++ optional (pythonOlder "3.5") typing;
+
+    meta = {
+      description = "CORS support for aiohttp";
+      homepage = "https://github.com/aio-libs/aiohttp-cors";
+      license = licenses.asl20;
+      maintainers = with maintainers; [ primeos ];
+    };
+  };
+
   alabaster = callPackage ../development/python-modules/alabaster {};
 
   alembic = callPackage ../development/python-modules/alembic {};