diff --git a/buzztrax.changes b/buzztrax.changes
index 8c0ed06..33a1b9d 100644
--- a/buzztrax.changes
+++ b/buzztrax.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Wed Aug 31 14:51:26 UTC 2022 - Bernhard Wiedemann <bwiedemann@suse.com>
+
+- Build non-parallel to make results reproducible
+
 -------------------------------------------------------------------
 Tue May 19 13:34:55 UTC 2020 - Dave Plater <davejplater@gmail.com>
 
diff --git a/buzztrax.spec b/buzztrax.spec
index 4869424..3d9f61f 100644
--- a/buzztrax.spec
+++ b/buzztrax.spec
@@ -240,7 +240,7 @@ export CXXFLAGS="$CFLAGS"
     --enable-gtk-doc
 cp -v docs/version.entities docs/help/bt-edit/C/
 
-make %{?_smp_mflags}
+make # non-parallel for https://github.com/Buzztrax/buzztrax/issues/89
 
 %install
 %make_install