diff --git a/dtc.changes b/dtc.changes
index 1a08ba6..5603423 100644
--- a/dtc.changes
+++ b/dtc.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Sun Dec  8 09:18:44 UTC 2019 - Martin Liška <mliska@suse.cz>
+
+- Use %make_build and recpect %optflags.
+
 -------------------------------------------------------------------
 Wed Oct 30 15:38:12 UTC 2019 - Dirk Mueller <dmueller@suse.com>
 
diff --git a/dtc.spec b/dtc.spec
index 74f1d51..2af4a9b 100644
--- a/dtc.spec
+++ b/dtc.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package dtc
 #
-# Copyright (c) 2019 SUSE LINUX GmbH, Nuernberg, Germany.
+# Copyright (c) 2019 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -73,7 +73,8 @@ Python binding part.
 %setup -q
 
 %build
-make %{?_smp_mflags} V=1 NO_PYTHON=1
+export EXTRA_CFLAGS="%{optflags}"
+%make_build NO_PYTHON=1
 cd pylibfdt
 python3 setup.py build_ext
 %py3_build
@@ -86,7 +87,8 @@ cd pylibfdt
 %python3_install
 
 %check
-make %{?_smp_mflags} check
+export EXTRA_CFLAGS="%{optflags}"
+%make_build check
 
 %files
 %license README.license