diff --git a/autogen.sh b/autogen.sh
index a98269f7..49d14c62 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -6,7 +6,7 @@ test -z "$srcdir" && srcdir=.
 ORIGDIR=`pwd`
 cd "$srcdir"
 
-autoreconf -v --install || exit 1
+autoreconf -f -v --install || exit 1
 cd "$ORIGDIR" || exit $?
 
 git config --local --get format.subjectPrefix >/dev/null 2>&1 ||