diff --git a/MozillaThunderbird.changes b/MozillaThunderbird.changes
index ef4590e..defa783 100644
--- a/MozillaThunderbird.changes
+++ b/MozillaThunderbird.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Wed Jul 10 13:47:41 UTC 2019 - Bernhard Wiedemann <bwiedemann@suse.com>
+
+- Generate langpacks sequentially to avoid file corruption
+  from racy file writes (boo#1137970)
+
 -------------------------------------------------------------------
 Thu Jun 20 22:15:46 UTC 2019 - Wolfgang Rosenauer <wr@rosenauer.org>
 
diff --git a/MozillaThunderbird.spec b/MozillaThunderbird.spec
index 72a2035..b449401 100644
--- a/MozillaThunderbird.spec
+++ b/MozillaThunderbird.spec
@@ -343,7 +343,7 @@ echo 'pref("browser.preferences.instantApply", true);' > %{buildroot}%{progdir}/
 %if %localize
 truncate -s 0 %{_tmppath}/translations.{common,other}
 sed -r '/^(ja-JP-mac|en-US|$)/d;s/ .*$//' $RPM_BUILD_DIR/thunderbird-%{version}/comm/mail/locales/shipped-locales \
-    | xargs -P 8 -n 1 -I {} /bin/sh -c '
+    | xargs -n 1 -I {} /bin/sh -c '
 	locale=$1
    	pushd $RPM_BUILD_DIR/compare-locales
 	PYTHONPATH=lib \