diff --git a/mariadb-bionic.list b/mariadb-bionic.list
index 2a2802e..ccc6294 100644
--- a/mariadb-bionic.list
+++ b/mariadb-bionic.list
@@ -1,5 +1,5 @@
 # sudo apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xF1656F24C74CD1D8
 # deb [arch=amd64,i386] http://ftp.hosteurope.de/mirror/mariadb.org/repo/10.3/ubuntu bionic main
 # deb [arch=amd64,i386] http://mirror.netcologne.de/mariadb/repo/10.3/ubuntu bionic main
-deb [arch=amd64,i386] http://mirror2.hs-esslingen.de/mariadb/repo/10.3/ubuntu bionic main
+deb [arch=amd64] http://mirror2.hs-esslingen.de/mariadb/repo/10.3/ubuntu bionic main
 
diff --git a/virtualbox.list b/virtualbox.list
index 920f486..004cfa3 100644
--- a/virtualbox.list
+++ b/virtualbox.list
@@ -1,3 +1,3 @@
 # VirtualBox
 # wget -q http://download.virtualbox.org/virtualbox/debian/oracle_vbox.asc -O- | sudo apt-key add -
-deb http://download.virtualbox.org/virtualbox/debian bionic contrib
+deb [arch=amd64] http://download.virtualbox.org/virtualbox/debian bionic contrib