diff --git a/site.mk b/site.mk
index 23a713e..23e55a4 100755
--- a/site.mk
+++ b/site.mk
@@ -33,7 +33,7 @@ GLUON_SITE_PACKAGES := \
 
 # Allow overriding the these variables from the command line
 GLUON_RELEASE ?= $(patsubst v%,%,$(shell git -C $(GLUON_SITEDIR) describe --tags --dirty=+))
-GLUON_BRANCH ?= stable
+export GLUON_BRANCH ?= stable
 GLUON_PRIORITY ?= 0
 GLUON_LANGS ?= en de
 GLUON_REGION ?= eu