diff --git a/lam-packaging/debian/rules b/lam-packaging/debian/rules
index 5f8d9e82..b03e729b 100755
--- a/lam-packaging/debian/rules
+++ b/lam-packaging/debian/rules
@@ -46,7 +46,7 @@ install:
 
 	# 3rd party libs are linked
 	install -d --mode=755 debian/ldap-account-manager/usr/share/ldap-account-manager/lib/3rdParty
-	install -D --mode=755 lib/3rdParty/yubico/*.php debian/ldap-account-manager/lib/3rdParty/yubico
+	install -D --mode=644 lib/3rdParty/yubico/*.php debian/ldap-account-manager/lib/3rdParty/yubico
 
 	cp -r locale debian/ldap-account-manager/usr/share/ldap-account-manager/
 	install -D --mode=644 sess/.htaccess debian/ldap-account-manager/var/lib/ldap-account-manager/sess/.htaccess