diff --git a/pkgs/applications/networking/flexget/default.nix b/pkgs/applications/networking/flexget/default.nix
index 29badfb1ca4..21ec3533976 100644
--- a/pkgs/applications/networking/flexget/default.nix
+++ b/pkgs/applications/networking/flexget/default.nix
@@ -14,6 +14,18 @@ let
           hash = "sha256-lfwC9/wfMZmqpHqKdXQ3E0z2GOnZlMhO/9U/Uww4WG8=";
         };
       });
+
+      # Flexget's transmission plugin is not currently compatible with the 4.x
+      # branch for transmission-rpc.
+      transmission-rpc = super.transmission-rpc.overridePythonAttrs (old: rec {
+        version = "3.4.2";
+        src = fetchFromGitHub {
+          owner = "Trim21";
+          repo = "transmission-rpc";
+          rev = "refs/tags/v${version}";
+          hash = "sha256-7XbL6plIPZHQ/0Z+7bvtj8hqkh4klFyIV73DnrUAkps=";
+        };
+      });
     };
   };
 in