diff --git a/common/gal/opengl/opengl_gal.cpp b/common/gal/opengl/opengl_gal.cpp
index f1b9b95031..07b5238cf1 100644
--- a/common/gal/opengl/opengl_gal.cpp
+++ b/common/gal/opengl/opengl_gal.cpp
@@ -233,8 +233,11 @@ void OPENGL_GAL::DrawLine( const VECTOR2D& aStartPoint, const VECTOR2D& aEndPoin
     drawLineQuad( aStartPoint, aEndPoint );
 
     // Line caps
-    drawFilledSemiCircle( aStartPoint, lineWidth / 2, lineAngle + M_PI / 2 );
-    drawFilledSemiCircle( aEndPoint,   lineWidth / 2, lineAngle - M_PI / 2 );
+    if( lineWidth > 1.0 )
+    {
+        drawFilledSemiCircle( aStartPoint, lineWidth / 2, lineAngle + M_PI / 2 );
+        drawFilledSemiCircle( aEndPoint,   lineWidth / 2, lineAngle - M_PI / 2 );
+    }
 }