diff --git a/nix/ext/pg_plan_filter.nix b/nix/ext/pg_plan_filter.nix
index 847c7a2d11..55c2eb508f 100644
--- a/nix/ext/pg_plan_filter.nix
+++ b/nix/ext/pg_plan_filter.nix
@@ -20,7 +20,7 @@ let
 
       src = fetchFromGitHub {
         owner = "pgexperts";
-        repo = pname;
+        repo = "pg_plan_filter";
         inherit rev hash;
       };