diff --git a/pkgs/development/python-modules/python-jsonrpc-server/default.nix b/pkgs/development/python-modules/python-jsonrpc-server/default.nix
index 12ad5170a7c..fa6ba97b406 100644
--- a/pkgs/development/python-modules/python-jsonrpc-server/default.nix
+++ b/pkgs/development/python-modules/python-jsonrpc-server/default.nix
@@ -16,7 +16,7 @@ buildPythonPackage rec {
   };
 
   postPatch = ''
-    sed -i 's/version=versioneer.get_version(),/version="${version}",/g' setup.py
+    sed -i "s/version=versioneer.get_version(),/version=\"$version\",/g" setup.py
     # https://github.com/palantir/python-jsonrpc-server/issues/36
     sed -iEe "s!'ujson.*\$!'ujson',!" setup.py
   '';