diff --git a/src/libslic3r/GCode/CoolingBuffer.cpp b/src/libslic3r/GCode/CoolingBuffer.cpp
index fe14a9e492..f1b1d97b6d 100644
--- a/src/libslic3r/GCode/CoolingBuffer.cpp
+++ b/src/libslic3r/GCode/CoolingBuffer.cpp
@@ -777,7 +777,7 @@ std::string CoolingBuffer::apply_layer_cooldown(
         //BBS
         if (additional_fan_speed_new != m_additional_fan_speed) {
             m_additional_fan_speed = additional_fan_speed_new;
-            if (immediately_apply)
+            if (immediately_apply && m_config.auxiliary_fan.value)
                 new_gcode += GCodeWriter::set_additional_fan(m_additional_fan_speed);
         }
     };
@@ -813,7 +813,7 @@ std::string CoolingBuffer::apply_layer_cooldown(
             //BBS: force to write a fan speed command again
             if (m_current_fan_speed != -1)
                 new_gcode += GCodeWriter::set_fan(m_config.gcode_flavor, m_current_fan_speed);
-            if (m_additional_fan_speed != -1)
+            if (m_additional_fan_speed != -1 && m_config.auxiliary_fan.value)
                 new_gcode += GCodeWriter::set_additional_fan(m_additional_fan_speed);
         }
         else if (line->type & CoolingLine::TYPE_EXTRUDE_END) {