diff --git a/expat.spec b/expat.spec
index d8e2b74..182da70 100644
--- a/expat.spec
+++ b/expat.spec
@@ -131,7 +131,7 @@ cp %{S:1} .
 rm -f examples/*.dsp
 
 %build
-autoreconf
+autoreconf -fi
 %configure --disable-static --with-pic
 make %{?_smp_mflags}