diff --git a/xs/src/libslic3r/PrintConfig.cpp b/xs/src/libslic3r/PrintConfig.cpp
index 538267288..565f4ced9 100644
--- a/xs/src/libslic3r/PrintConfig.cpp
+++ b/xs/src/libslic3r/PrintConfig.cpp
@@ -1147,7 +1147,7 @@ PrintConfigDef::PrintConfigDef()
     def->tooltip = "Speed (baud) of USB/serial port for printer connection.";
     def->cli = "serial-speed=i";
     def->min = 1;
-    def->max = 300000;
+    def->max = 500000;
     def->enum_values.push_back("57600");
     def->enum_values.push_back("115200");
     def->enum_values.push_back("250000");