diff --git a/pkgs/by-name/ba/babeld/package.nix b/pkgs/by-name/ba/babeld/package.nix
index 4fd86e16f446d..e725c7424766b 100644
--- a/pkgs/by-name/ba/babeld/package.nix
+++ b/pkgs/by-name/ba/babeld/package.nix
@@ -4,12 +4,12 @@
 , nixosTests
 }:
 
-stdenv.mkDerivation rec {
+stdenv.mkDerivation (finalAttrs: {
   pname = "babeld";
   version = "1.13.1";
 
   src = fetchurl {
-    url = "https://www.irif.fr/~jch/software/files/${pname}-${version}.tar.gz";
+    url = "https://www.irif.fr/~jch/software/files/${finalAttrs.pname}-${finalAttrs.version}.tar.gz";
     hash = "sha256-FfJNJtoMz8Bzq83vAwnygeRoTyqnESb4JlcsTIRejdk=";
   };
 
@@ -33,4 +33,4 @@ stdenv.mkDerivation rec {
     platforms = platforms.linux;
     mainProgram = "babeld";
   };
-}
+})