diff --git a/install.sh b/install.sh
index 5dc9718..1a72c09 100755
--- a/install.sh
+++ b/install.sh
@@ -463,7 +463,7 @@ launch_navigator() {
 # ---------------------------------------------------------------------------
 # Main
 # ---------------------------------------------------------------------------
-if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]] || [[ -z "${BASH_SOURCE[0]}" ]]; then
     _OWL_RUNNING=true
 
     _owl_cleanup() {