diff --git a/install.sh b/install.sh
index 685423a5e0..3f65913e91 100755
--- a/install.sh
+++ b/install.sh
@@ -7,7 +7,7 @@ BIN_DIR="$HOME/.local/bin"
 BIN_PATH="$BIN_DIR/$APP_NAME"
 PLATFORM="$(uname)"
 
-if [ -n "$1" ]; then
+if [ -n "${1:-}" ]; then
   RELEASE="tag/$1"
   DOWNLOAD="download/$1"
   echo "downloading SimpleX Chat $1 ..."