diff --git a/components/lazmapviewer/source/mvmapviewer.pas b/components/lazmapviewer/source/mvmapviewer.pas
index 44477513b..e6a757752 100644
--- a/components/lazmapviewer/source/mvmapviewer.pas
+++ b/components/lazmapviewer/source/mvmapviewer.pas
@@ -4172,6 +4172,7 @@ begin
   DE.PenWidth := 3;
   DE.BrushColor := clGray;
   DE.BrushStyle := bsSolid;
+  DE.Opacity := 1.0;
 
   if Assigned(FLit) then
     DE.Rectangle(FPt.X - 5, FPt.Y - 5, FPt.X + 5, FPt.Y + 5);