diff --git a/pkgs/development/python-modules/kaldi-active-grammar/fork.nix b/pkgs/development/python-modules/kaldi-active-grammar/fork.nix
index 7b5b30b5ec7e..7748e34df6f2 100644
--- a/pkgs/development/python-modules/kaldi-active-grammar/fork.nix
+++ b/pkgs/development/python-modules/kaldi-active-grammar/fork.nix
@@ -9,7 +9,7 @@
 , python3
 , openblas
 , zlib
-, gfortran-tmp-noisystem
+, gfortran
 }:
 
 let
@@ -56,7 +56,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [
     pkg-config
     python3
-    gfortran-tmp-noisystem
+    gfortran
   ];
 
   buildFlags = [