diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index 4d98fe33b5..adc1e2e447 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -1302,7 +1302,7 @@ void GLCanvas3D::Labels::render(const std::vector<const ModelInstance*>& sorted_
                 return owner.model_instance_id == id;
                 });
             if (it != owners.end())
-                it->print_order = _(L("Seq.")) + "#: " + std::to_string(i + 1);
+                it->print_order = std::string((_(L("Seq."))).ToUTF8()) + "#: " + std::to_string(i + 1);
         }
     }