diff --git a/lib/system-detect.sh b/lib/system-detect.sh
index 0fb82cb..88d6b19 100755
--- a/lib/system-detect.sh
+++ b/lib/system-detect.sh
@@ -68,8 +68,8 @@ detect_control_panel() {
         SYS_LOG_DIR="/var/www/vhosts/system"
 
         # Source Plesk helpers for advanced functionality
-        if [ -f "$SCRIPT_DIR/plesk-helpers.sh" ]; then
-            source "$SCRIPT_DIR/plesk-helpers.sh"
+        if [ -f "${LIB_DIR:-$SCRIPT_DIR/lib}/plesk-helpers.sh" ]; then
+            source "${LIB_DIR:-$SCRIPT_DIR/lib}/plesk-helpers.sh"
         fi
 
         print_success "Detected Plesk v${SYS_CONTROL_PANEL_VERSION}"