diff --git a/ibus.changes b/ibus.changes
index 97f7a1e..d4af78c 100644
--- a/ibus.changes
+++ b/ibus.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Mon Feb  1 15:25:13 UTC 2021 - Bernhard Wiedemann <bwiedemann@suse.com>
+
+- Do not build in parallel for reproducible build results (boo#1102408)
+
 -------------------------------------------------------------------
 Mon Oct 26 08:18:51 UTC 2020 - Callum Farmer <callumjfarmer13@gmail.com>
 
diff --git a/ibus.spec b/ibus.spec
index d7b9372..1ccbaa0 100644
--- a/ibus.spec
+++ b/ibus.spec
@@ -222,7 +222,8 @@ autoreconf -fi
            --enable-surrounding-text \
            --libexecdir=%{_libdir}/ibus
 
-make %{?_smp_mflags}
+# non-parallel to have reproducible results in spite of non-deterministic build scripts https://github.com/ibus/ibus/issues/2272
+make
 
 %install
 %make_install