diff --git a/pkgs/development/python-modules/scikit-learn/0.20.nix b/pkgs/development/python-modules/scikit-learn/0.20.nix
index 81915e83d2dc..0ed863755897 100644
--- a/pkgs/development/python-modules/scikit-learn/0.20.nix
+++ b/pkgs/development/python-modules/scikit-learn/0.20.nix
@@ -16,7 +16,8 @@ buildPythonPackage rec {
     sha256 = "1z3w2c50dwwa297j88pr16pyrjysagsvdj7vrlq40q8777rs7a6z";
   };
 
-  buildInputs = [ pillow gfortran glibcLocales ];
+  nativeBuildInputs = [ gfortran ];
+  buildInputs = [ pillow glibcLocales ];
   propagatedBuildInputs = [ numpy scipy numpy.blas ];
   checkInputs = [ pytest ];