diff --git a/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp b/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp
index 317d7ebca..6d3d162b7 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoPainterBase.cpp
@@ -283,7 +283,7 @@ bool GLGizmoPainterBase::gizmo_event(SLAGizmoEventType action, const Vec2d& mous
             return true;
         }
         else if (alt_down) {
-            if (m_tool_type == ToolType::BRUSH) {
+            if (m_tool_type == ToolType::BRUSH && (m_cursor_type == TriangleSelector::CursorType::SPHERE || m_cursor_type == TriangleSelector::CursorType::CIRCLE)) {
                 m_cursor_radius = action == SLAGizmoEventType::MouseWheelDown ? std::max(m_cursor_radius - CursorRadiusStep, CursorRadiusMin)
                                                                               : std::min(m_cursor_radius + CursorRadiusStep, CursorRadiusMax);
                 m_parent.set_as_dirty();