diff --git a/pkgs/development/python-modules/epc/default.nix b/pkgs/development/python-modules/epc/default.nix
index 97ff188a3623..0c9d9c679feb 100644
--- a/pkgs/development/python-modules/epc/default.nix
+++ b/pkgs/development/python-modules/epc/default.nix
@@ -24,6 +24,6 @@ buildPythonPackage (finalAttrs: {
   meta = {
     description = "EPC (RPC stack for Emacs Lisp) implementation in Python";
     homepage = "https://github.com/tkf/python-epc";
-    license = lib.licenses.gpl3;
+    license = lib.licenses.gpl3Only;
   };
 })