diff --git a/thunderbird.spec b/thunderbird.spec
index bfbf333..e87a359 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -257,7 +257,7 @@ rm -f $RPM_BUILD_ROOT/%{_bindir}/thunderbird
 touch %{name}.lang
 %if %{build_langpacks}
 %{__mkdir_p} $RPM_BUILD_ROOT%{mozappdir}/langpacks
-%{__tar} xjf %{SOURCE1}
+%{__tar} xf %{SOURCE1}
 for langpack in `ls thunderbird-langpacks/*.xpi`; do
   language=`basename $langpack .xpi`
   extensiondir=$RPM_BUILD_ROOT%{mozappdir}/langpacks/langpack-$language@thunderbird.mozilla.org