diff --git a/pkgs/applications/networking/mailreaders/notmuch/default.nix b/pkgs/applications/networking/mailreaders/notmuch/default.nix
index 8bb16acd59e3..7b2b29033fdf 100644
--- a/pkgs/applications/networking/mailreaders/notmuch/default.nix
+++ b/pkgs/applications/networking/mailreaders/notmuch/default.nix
@@ -86,7 +86,7 @@ stdenv.mkDerivation rec {
   dontGzipMan = true; # already compressed
 
   passthru = {
-    pythonSourceRoot = "${src.name}/bindings/python";
+    pythonSourceRoot = "notmuch-${version}/bindings/python";
     inherit version;
   };