diff --git a/tools/build/envDefaults b/tools/build/envDefaults
index 71d4cf4..473095c 100644
--- a/tools/build/envDefaults
+++ b/tools/build/envDefaults
@@ -6,6 +6,7 @@
 # M2 repository and Karaf gold bits
 export M2_REPO=${M2_REPO:-~/.m2/repository}
 export KARAF_ZIP=${KARAF_ZIP:-~/Downloads/apache-karaf-3.0.1.zip}
+export KARAF_TAR=${KARAF_TAR:-~/Downloads/apache-karaf-3.0.1.tar.gz}
 export KARAF_DIST=$(basename $KARAF_ZIP .zip)
 
 # ONOS Version and onos.tar.gz staging environment