diff --git a/pkgs/development/tools/flock/default.nix b/pkgs/development/tools/flock/default.nix
index c9c71a9f8592..d55c964d2fc4 100644
--- a/pkgs/development/tools/flock/default.nix
+++ b/pkgs/development/tools/flock/default.nix
@@ -11,8 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "sha256-cCpckORtogs6Nt7c5q2+z0acXAnALdLV6uzxa5ng3s4=";
   };
 
-  nativeBuildInputs = [ autoreconfHook ];
-  buildInputs = [ ronn ];
+  nativeBuildInputs = [ autoreconfHook ronn ];
 
   patches = [
     (fetchpatch {