diff --git a/resources/shaders/110/silhouette_composite.fs b/resources/shaders/110/silhouette_composite.fs
index d9c1157d9..2fe8d0e48 100644
--- a/resources/shaders/110/silhouette_composite.fs
+++ b/resources/shaders/110/silhouette_composite.fs
@@ -14,6 +14,9 @@ void main()
     vec4 pixels[9];
     float deltaWidth = 1.0 / u_viewport_size.x;
     float deltaHeight = 1.0 / u_viewport_size.y;
+    float effect_width = 2.0f;
+    deltaWidth = deltaWidth * effect_width;
+    deltaHeight = deltaHeight * effect_width;
     pixels[0] = sample(-deltaWidth, deltaHeight );
     pixels[1] = sample(0.0, deltaHeight );
     pixels[2] = sample(deltaWidth, deltaHeight );
diff --git a/resources/shaders/140/silhouette_composite.fs b/resources/shaders/140/silhouette_composite.fs
index 64a5d1622..7baf85d92 100644
--- a/resources/shaders/140/silhouette_composite.fs
+++ b/resources/shaders/140/silhouette_composite.fs
@@ -16,9 +16,9 @@ void main()
     vec4 pixels[9];
     float deltaWidth = 1.0 / u_viewport_size.x;
     float deltaHeight = 1.0 / u_viewport_size.y;
-    float effect_width = 1.0f;
-    deltaWidth = deltaWidth * effect_width;
+    float effect_width = 2.0f;
     deltaWidth = deltaWidth * effect_width;
+    deltaHeight = deltaHeight * effect_width;
 
     pixels[0] = sample(-deltaWidth, deltaHeight );
     pixels[1] = sample(0.0, deltaHeight );
diff --git a/src/slic3r/GUI/GLCanvas3D.cpp b/src/slic3r/GUI/GLCanvas3D.cpp
index aa2963c81..dbc41df20 100644
--- a/src/slic3r/GUI/GLCanvas3D.cpp
+++ b/src/slic3r/GUI/GLCanvas3D.cpp
@@ -10256,7 +10256,7 @@ void GLCanvas3D::_render_silhouette_effect()
     }
 
     auto& ogl_manager = *p_ogl_manager;
-    float t_viewport_scale = 0.5f;
+    float t_viewport_scale = 1.0f;
     uint32_t viewport_width = 0;
     uint32_t viewport_height = 0;
     ogl_manager.get_viewport_size(viewport_width, viewport_height);