diff --git a/xs/src/libslic3r/GCodeWriter.cpp b/xs/src/libslic3r/GCodeWriter.cpp
index c24c8ad33..8b1e56754 100644
--- a/xs/src/libslic3r/GCodeWriter.cpp
+++ b/xs/src/libslic3r/GCodeWriter.cpp
@@ -163,7 +163,7 @@ std::string
 GCodeWriter::set_fan(unsigned int speed, bool dont_save)
 {
     std::ostringstream gcode;
-    const double baseline_factor = (this->config.fan_percentage ? 1.0 : 255.0);
+    const double baseline_factor = (this->config.fan_percentage ? 100.0 : 255.0);
     if (this->_last_fan_speed != speed || dont_save) {
         if (!dont_save) this->_last_fan_speed = speed;