diff --git a/site.mk b/site.mk
index 24e4c0a4b4705de905e9c650b07d6bbc5b11046a..44b9eb470ccd1f4d7e100021cd18dfeceba5e1ab 100644
--- a/site.mk
+++ b/site.mk
@@ -26,3 +26,4 @@ DEFAULT_GLUON_RELEASE := 0.5.3+0$(shell date '+%Y%m%d')
 # Allow overriding the release number from the command line
 GLUON_RELEASE ?= $(DEFAULT_GLUON_RELEASE)
 
+GLUON_PRIORITY ?= 0