diff --git a/install.sh b/install.sh
index 87da1ac..a6638c2 100644
--- a/install.sh
+++ b/install.sh
@@ -14,7 +14,7 @@
 
 # Not every platform has or needs sudo, gotta save them O(1)s...
 sudo_cmd=""
-((EUID)) && [[ -z "$ANDROID_ROOT" ]] && sudo_cmd="sudo"
+((EUID)) && [[ -z "${ANDROID_ROOT:-}" ]] && sudo_cmd="sudo"
 
 deps_flag="$1"
 set -e