1 files changed, 1 insertions, 1 deletions

diff --git a/meta/conf/distro/poky.conf b/meta/conf/distro/poky.conf
index 400b8c2dd9..71e40de6f2 100644
--- a/meta/conf/distro/poky.conf
+++ b/meta/conf/distro/poky.conf
@@ -150,7 +150,7 @@ BB_GENERATE_MIRROR_TARBALLS ??= "0"
 
 require conf/distro/include/world-broken.inc
 
-PREMIRRORS =+ "\
+PREMIRRORS ?= "\
 bzr://.*/.*   http://autobuilder.yoctoproject.org/sources/ \n \
 cvs://.*/.*   http://autobuilder.yoctoproject.org/sources/ \n \
 git://.*/.*   http://autobuilder.yoctoproject.org/sources/ \n \