diff --git a/_constraints b/_constraints
index d5c1b35..6200bf7 100644
--- a/_constraints
+++ b/_constraints
@@ -1,10 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
 <constraints>
   <hardware>
-   <physicalmemory>
+    <physicalmemory>
       <size unit="G">3</size>
-   </physicalmemory>
-   <memory>
+    </physicalmemory>
+    <memory>
       <size unit="G">5</size>
-   </memory>
+    </memory>
+    <memoryperjob>
+      <size unit="M">2200</size>
+    </memoryperjob>
   </hardware>
 </constraints>
diff --git a/openscad.changes b/openscad.changes
index 56ca9ff..443cacd 100644
--- a/openscad.changes
+++ b/openscad.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Thu Aug 20 09:03:01 UTC 2020 - Martin Liška <mliska@suse.cz>
+
+- Use memoryperjob constraint instead of %limit_build macro.
+
 -------------------------------------------------------------------
 Sun Mar 22 07:56:55 UTC 2020 - Christophe Giboudeaux <christophe@krop.fr>
 
diff --git a/openscad.spec b/openscad.spec
index 857c313..9658ec6 100644
--- a/openscad.spec
+++ b/openscad.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package openscad
 #
-# Copyright (c) 2019 SUSE LINUX GmbH, Nuernberg, Germany.
+# Copyright (c) 2020 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -22,7 +22,7 @@ Release:        0
 Summary:        Programmers Solid 3D CAD Modeller
 License:        GPL-3.0-or-later
 Group:          Productivity/Graphics/CAD
-Url:            https://www.openscad.org/
+URL:            https://www.openscad.org/
 Source:         https://files.openscad.org/%{name}-%{version}.src.tar.gz
 BuildRequires:  bison
 BuildRequires:  double-conversion-devel
@@ -39,7 +39,6 @@ BuildRequires:  libboost_thread-devel
 BuildRequires:  libcgal-devel
 BuildRequires:  libqscintilla-qt5-devel
 BuildRequires:  libspnav-devel
-BuildRequires:  memory-constraints
 BuildRequires:  opencsg-devel
 BuildRequires:  pkgconfig(Qt5Concurrent)
 BuildRequires:  pkgconfig(Qt5Core)
@@ -62,7 +61,6 @@ aspects, e.g. modelling of machine parts.
 
 %build
 qmake-qt5 PREFIX=%{_prefix} QMAKE_CXXFLAGS="%{optflags}" CONFIG+=qopenglwidget
-%limit_build -m 2200
 make %{?_smp_mflags}
 
 %install