diff --git a/egi/voms/defaults/main.yml b/egi/voms/defaults/main.yml
index 8b8e26c7..643741d2 100644
--- a/egi/voms/defaults/main.yml
+++ b/egi/voms/defaults/main.yml
@@ -2,9 +2,9 @@
 # Reference: http://italiangrid.github.io/voms/documentation/voms-clients-guide
 voms_egi_install: True
 voms_egi_repo_key: "http://repository.egi.eu/sw/production/umd/UMD-DEB-PGP-KEY"
-voms_egi_trustanchors_repo: "deb http://repository.egi.eu/sw/production/cas/1/current egi-igtf core"
-voms_base_client_repo: "deb http://repository.egi.eu/sw/production/umd/3/debian/ squeeze main"
-voms_updates_client_repo: "deb http://repository.egi.eu/sw/production/umd/3/debian/ squeeze-updates main"
+voms_egi_trustanchors_repo: "deb [arch=amd64] http://repository.egi.eu/sw/production/cas/1/current egi-igtf core"
+voms_base_client_repo: "deb [arch=amd64] http://repository.egi.eu/sw/production/umd/3/debian/ squeeze main"
+voms_updates_client_repo: "deb [arch=amd64] http://repository.egi.eu/sw/production/umd/3/debian/ squeeze-updates main"
 voms_config_base_directory: /etc/vomses
 voms_trustanchors_base_directory: /etc/grid-security/vomsdir