diff --git a/software/mariadb/software.cfg b/software/mariadb/software.cfg
index 7880da33e07206cdf36cf0f583c754aa711d4a05..e0d39c0d82ebf802465fa41a444a10546831c124 100644
--- a/software/mariadb/software.cfg
+++ b/software/mariadb/software.cfg
@@ -9,7 +9,7 @@ extensions =
   slapos.rebootstrap
   mr.developer
 
-find-links =
+find-links +=
     http://www.nexedi.org/static/packages/source/slapos.buildout/
 
 extends =
diff --git a/software/mysql-tritonn-5.0/software.cfg b/software/mysql-tritonn-5.0/software.cfg
index 5f1bf840666433328a5bc0e1616e9e3330c8c3f8..ce1565ebbe5f0e0b7d7796a9b0827b3a51c048bc 100644
--- a/software/mysql-tritonn-5.0/software.cfg
+++ b/software/mysql-tritonn-5.0/software.cfg
@@ -9,7 +9,7 @@ extensions =
   slapos.rebootstrap
   mr.developer
 
-find-links =
+find-links +=
     http://www.nexedi.org/static/packages/source/slapos.buildout/
 
 extends =