diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 241a36fb6..d30bb5ed2 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -4341,11 +4341,14 @@ void PrintConfigDef::init_fff_params()
     def->set_default_value(new ConfigOptionFloat(0.));
 
     def = this->add("prime_tower_brim_width", coFloat);
+    def->gui_type = ConfigOptionDef::GUIType::f_enum_open;
     def->label = L("Brim width");
-    def->tooltip = L("Brim width of wipe tower, -1 means auto calculated width based on the height of wipe tower.");
+    def->tooltip = L("Brim width of wipe tower, negative number means auto calculated width based on the height of wipe tower.");
     def->sidetext = L("mm");
     def->mode = comAdvanced;
     def->min = -1;
+    def->enum_values.push_back("-1");
+    def->enum_labels.push_back(L("Auto"));
     def->set_default_value(new ConfigOptionFloat(3.));
 
     def           = this->add("prime_tower_extra_rib_length", coFloat);