diff --git a/src/slic3r/GUI/GCodeViewer.cpp b/src/slic3r/GUI/GCodeViewer.cpp
index 1d4551f2e..426aad355 100644
--- a/src/slic3r/GUI/GCodeViewer.cpp
+++ b/src/slic3r/GUI/GCodeViewer.cpp
@@ -789,7 +789,8 @@ void GCodeViewer::refresh(const GCodeProcessor::Result& gcode_result, const std:
             m_extrusions.ranges.width.update_from(round_to_nearest_percent(curr.width));
             m_extrusions.ranges.fan_speed.update_from(curr.fan_speed);
             m_extrusions.ranges.temperature.update_from(curr.temperature);
-            m_extrusions.ranges.volumetric_rate.update_from(round_to_nearest_percent(curr.volumetric_rate()));
+            if (curr.extrusion_role != erCustom || is_visible(erCustom))
+                m_extrusions.ranges.volumetric_rate.update_from(round_to_nearest_percent(curr.volumetric_rate()));
             [[fallthrough]];
         }
         case EMoveType::Travel: