diff --git a/src/slic3r/GUI/Search.cpp b/src/slic3r/GUI/Search.cpp
index 1af33eb05f..cc3811d36e 100644
--- a/src/slic3r/GUI/Search.cpp
+++ b/src/slic3r/GUI/Search.cpp
@@ -213,7 +213,7 @@ bool OptionsSearcher::search(const std::string &search, bool force /* = false*/,
     };
 
     auto get_tooltip = [this, &sep](const Option &opt) {
-        return marker_by_type(opt.type, printer_technology) + opt.category_local + sep + opt.group_local + sep + opt.label_local;
+        return wxString(marker_by_type(opt.type, printer_technology)) + opt.category_local + sep + opt.group_local + sep + opt.label_local;
     };
 
     std::vector<uint16_t> matches, matches2;