1 files changed, 1 insertions, 3 deletions
diff --git a/pkgs/development/tools/parsing/flex/default.nix b/pkgs/development/tools/parsing/flex/default.nix
index 3a4e3649e00..b48a1d8621f 100644
--- a/pkgs/development/tools/parsing/flex/default.nix
+++ b/pkgs/development/tools/parsing/flex/default.nix
@@ -1,13 +1,11 @@
 {stdenv, fetchurl, yacc}:
 assert yacc != null;
-derivation {
+stdenv.mkDerivation {
   name = "flex-2.5.4a";
-  system = stdenv.system;
   builder = ./builder.sh;
   src = fetchurl {
     url = ftp://ftp.nluug.nl/pub/gnu/flex/flex-2.5.4a.tar.gz;
     md5 = "bd8753d0b22e1f4ec87a553a73021adf";
   };
-  stdenv = stdenv;
   yacc = yacc;
 }