diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index f6cae37d8..54a688e29 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -1901,6 +1901,7 @@ void PrintConfigDef::init_fff_params()
     def->tooltip = L("Diameter of nozzle");
     def->sidetext = L("mm");
     def->mode = comAdvanced;
+    def->max = 1.0;
     def->set_default_value(new ConfigOptionFloats { 0.4 });
 
     def = this->add("host_type", coEnum);