diff --git a/tools/build/onos-build b/tools/build/onos-build
index dc2443d..b9c752e 100755
--- a/tools/build/onos-build
+++ b/tools/build/onos-build
@@ -3,6 +3,8 @@
 # Builds the ONOS from source.
 # -----------------------------------------------------------------------------
 
+set -e
+
 [ ! -d "$ONOS_ROOT" ] && echo "ONOS_ROOT is not defined" >&2 && exit 1
 . $ONOS_ROOT/tools/build/envDefaults