diff --git a/pkgs/development/libraries/ncurses/default.nix b/pkgs/development/libraries/ncurses/default.nix
index 55e6621ac4c1..e573806e8d2a 100644
--- a/pkgs/development/libraries/ncurses/default.nix
+++ b/pkgs/development/libraries/ncurses/default.nix
@@ -147,7 +147,7 @@ stdenv.mkDerivation (finalAttrs: {
   preConfigure = ''
     export PKG_CONFIG_LIBDIR="$dev/lib/pkgconfig"
     mkdir -p "$PKG_CONFIG_LIBDIR"
-    configureFlagsArray+=(
+    configureFlags+=(
       "--libdir=$out/lib"
       "--includedir=$dev/include"
       "--bindir=$dev/bin"
@@ -259,6 +259,8 @@ stdenv.mkDerivation (finalAttrs: {
     execer cannot bin/{reset,tput,tset}
   '';
 
+  __structuredAttrs = true;
+
   meta = {
     homepage = "https://www.gnu.org/software/ncurses/";
     description = "Free software emulation of curses in SVR4 and more";