diff --git a/src/slic3r/GUI/Widgets/AMSControl.cpp b/src/slic3r/GUI/Widgets/AMSControl.cpp
index 242f440838..533e57cf07 100644
--- a/src/slic3r/GUI/Widgets/AMSControl.cpp
+++ b/src/slic3r/GUI/Widgets/AMSControl.cpp
@@ -1189,8 +1189,10 @@ void AMSLib::render_generic_lib(wxDC &dc)
 
 void AMSLib::on_pass_road(bool pass)
 {
-    m_pass_road = pass;
-    Refresh();
+    if (m_pass_road != pass) {
+        m_pass_road = pass;
+        Refresh();
+    }
 }
 
 void AMSLib::Update(Caninfo info, bool refresh)