diff --git a/pkgs/development/libraries/ustr/default.nix b/pkgs/by-name/us/ustr/package.nix
similarity index 69%
rename from pkgs/development/libraries/ustr/default.nix
rename to pkgs/by-name/us/ustr/package.nix
index 69d74046d789..0da93206752b 100644
--- a/pkgs/development/libraries/ustr/default.nix
+++ b/pkgs/by-name/us/ustr/package.nix
@@ -1,4 +1,8 @@
-{ lib, stdenv, fetchgit }:
+{
+  lib,
+  stdenv,
+  fetchgit,
+}:
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "ustr";
@@ -18,15 +22,19 @@ stdenv.mkDerivation (finalAttrs: {
 
   # Fix detection of stdint.h
   postPatch = ''
-    sed -i 's,\(have_stdint_h\)=0,\1=1,g' Makefile
-    sed -i 's,\(USTR_CONF_HAVE_STDINT_H\) 0,\1 1,g' ustr-import.in
+    substituteInPlace Makefile \
+      --replace-fail "have_stdint_h=0" "have_stdint_h=1"
+
+    cat ustr-import.in | grep USTR_CONF
+    substituteInPlace ustr-import.in \
+      --replace-fail "USTR_CONF_HAVE_STDINT_H 0" "USTR_CONF_HAVE_STDINT_H 1"
   '';
 
-  preBuild = ''
-    makeFlagsArray+=("prefix=$out")
-    makeFlagsArray+=("LDCONFIG=echo")
-    makeFlagsArray+=("HIDE=")
-  '';
+  makeFlags = [
+    "prefix=${placeholder "out"}"
+    "LDCONFIG=echo"
+    "HIDE="
+  ];
 
   # Remove debug libraries
   postInstall = ''
diff --git a/pkgs/development/libraries/ustr/va_args.patch b/pkgs/by-name/us/ustr/va_args.patch
similarity index 100%
rename from pkgs/development/libraries/ustr/va_args.patch
rename to pkgs/by-name/us/ustr/va_args.patch
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index a38897c6125b..b9d42b592a6a 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -24804,8 +24804,6 @@ with pkgs;
 
   unixODBCDrivers = recurseIntoAttrs (callPackages ../development/libraries/unixODBCDrivers { });
 
-  ustr = callPackage ../development/libraries/ustr { };
-
   usrsctp = callPackage ../development/libraries/usrsctp { };
 
   usbredir = callPackage ../development/libraries/usbredir { };