diff --git a/winehelper b/winehelper
index 97d4bee..0b664ad 100755
--- a/winehelper
+++ b/winehelper
@@ -2183,7 +2183,7 @@ select_component_version() {
 }
 
 run_install_to_prefix() {
-    if [[ -z "$1" ]] || [[ -z "$2" ]] || [[ -f "$2" ]] ; then
+    if [[ -z "$1" ]] || [[ -z "$2" ]] || ! [[ -f "$2" ]] ; then
         fatal "Использование: $SCRIPT_NAME install-to-prefix <имя_префикса> <путь_к_установщику>"
     fi