diff --git a/pkgs/development/interpreters/erlang/generic-builder.nix b/pkgs/development/interpreters/erlang/generic-builder.nix
index 1d2b79074fb4..6ea3ac73a4b1 100644
--- a/pkgs/development/interpreters/erlang/generic-builder.nix
+++ b/pkgs/development/interpreters/erlang/generic-builder.nix
@@ -65,9 +65,9 @@ in stdenv.mkDerivation ({
   '';
 
   postPatch = ''
-    ${postPatch}
-
     patchShebangs make
+
+    ${postPatch}
   '';
 
   preConfigure = ''
@@ -88,9 +88,9 @@ in stdenv.mkDerivation ({
   # (PDFs are generated only when fop is available).
 
   postInstall = ''
-    ${postInstall}
-
     ln -s $out/lib/erlang/lib/erl_interface*/bin/erl_call $out/bin/erl_call
+
+    ${postInstall}
   '';
 
   # Some erlang bin/ scripts run sed and awk