diff --git a/install.sh b/install.sh
index 43e9319..3814b5e 100755
--- a/install.sh
+++ b/install.sh
@@ -8,5 +8,6 @@ set -x
 
 cp -afv ipsilon ${ROOT}${SITE_PACKAGES}/
 python3 -m compileall ${ROOT}${SITE_PACKAGES}/ipsilon
-cat openid-server.patch | patch -p0 --fuzz 0 -d ${ROOT}${SITE_PACKAGES}/ -N
+patch_cmd="cat openid-server.patch | patch -p0 --fuzz 0 -d ${ROOT}${SITE_PACKAGES}/ -N -r -"
+eval $patch_cmd || eval $patch_cmd --dry-run | grep "2 out of 2 hunks ignored"
 python3 -m compileall ${ROOT}${SITE_PACKAGES}/openid