diff --git a/pkgs/development/interpreters/lfe/generic-builder.nix b/pkgs/development/interpreters/lfe/generic-builder.nix
index ada99e525c81..5e6016d4e97e 100644
--- a/pkgs/development/interpreters/lfe/generic-builder.nix
+++ b/pkgs/development/interpreters/lfe/generic-builder.nix
@@ -18,13 +18,9 @@ let
 
   proper = buildHex {
     name = "proper";
-    version = "1.1.1-beta";
+    version = "1.4.0";
 
-    sha256  = "0hnkhs761yjynw9382w8wm4j3x0r7lllzavaq2kh9n7qy3zc1rdx";
-
-    configurePhase = ''
-      ${erlang}/bin/escript write_compile_flags include/compile_flags.hrl
-    '';
+    sha256  = "sha256-GChYQhhb0z772pfRNKXLWgiEOE2zYRn+4OPPpIhWjLs=";
   };
 
 in