diff --git a/arcup/arcup b/arcup/arcup
index 5d7c9e1..6b8b802 100755
--- a/arcup/arcup
+++ b/arcup/arcup
@@ -181,6 +181,9 @@ while [[ $# -gt 0 ]]; do
             version
             ;;
         -i|--install)
+            if [[ $# -lt 2 || -z "$2" || "$2" == -* ]]; then
+                error "--install requires a version argument (for example: arcup --install v1.0.0)"
+            fi
             VERSION="$2"
             shift 2
             ;;