diff --git a/pkgs/development/libraries/science/biology/elastix/default.nix b/pkgs/development/libraries/science/biology/elastix/default.nix
index e88e79cdcf4..66bde6c14e6 100644
--- a/pkgs/development/libraries/science/biology/elastix/default.nix
+++ b/pkgs/development/libraries/science/biology/elastix/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, cmake, itk, python }:
+{ stdenv, fetchFromGitHub, cmake, itk, python3 }:
 
 stdenv.mkDerivation rec {
   pname    = "elastix";
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
     rev    = version;
     sha256 = "1zrl7rz4lwsx88b2shnl985f3a97lmp4ksbd437h9y0hfjq8l0lj";
   };
-  nativeBuildInputs = [ cmake python ];
+  nativeBuildInputs = [ cmake python3 ];
   buildInputs = [ itk ];
 
   meta = with stdenv.lib; {