diff --git a/expat/buildconf.sh b/expat/buildconf.sh
index 907ce101..27c01e14 100755
--- a/expat/buildconf.sh
+++ b/expat/buildconf.sh
@@ -1,2 +1,2 @@
 #! /bin/sh
-exec autoreconf -i
+exec autoreconf -i -f