diff --git a/resources/shaders/flat.fs b/resources/shaders/flat.fs
new file mode 100644
index 0000000000..ab656998df
--- /dev/null
+++ b/resources/shaders/flat.fs
@@ -0,0 +1,8 @@
+#version 110
+
+uniform vec4 uniform_color;
+
+void main()
+{
+    gl_FragColor = uniform_color;
+}
diff --git a/resources/shaders/flat.vs b/resources/shaders/flat.vs
new file mode 100644
index 0000000000..d9063f0c70
--- /dev/null
+++ b/resources/shaders/flat.vs
@@ -0,0 +1,11 @@
+#version 110
+
+uniform mat4 view_model_matrix;
+uniform mat4 projection_matrix;
+
+attribute vec3 v_position;
+
+void main()
+{
+    gl_Position = projection_matrix * view_model_matrix * vec4(v_position, 1.0);
+}
diff --git a/src/slic3r/GUI/GLShadersManager.cpp b/src/slic3r/GUI/GLShadersManager.cpp
index 8a25bf6227..0d06d37332 100644
--- a/src/slic3r/GUI/GLShadersManager.cpp
+++ b/src/slic3r/GUI/GLShadersManager.cpp
@@ -34,11 +34,12 @@ std::pair<bool, std::string> GLShadersManager::init()
     bool valid = true;
 
     // used to render bed axes and model, selection hints, gcode sequential view marker model, preview shells, options in gcode preview
-   valid &= append_shader("gouraud_light", { "gouraud_light.vs", "gouraud_light.fs" });
+    valid &= append_shader("gouraud_light", { "gouraud_light.vs", "gouraud_light.fs" });
     //used to render thumbnail
-   valid &= append_shader("thumbnail", { "thumbnail.vs", "thumbnail.fs" });
-   // used to render first layer for calibration
-   valid &= append_shader("cali", { "cali.vs", "cali.fs"});
+    valid &= append_shader("thumbnail", { "thumbnail.vs", "thumbnail.fs" });
+    // used to render first layer for calibration
+    valid &= append_shader("cali", { "cali.vs", "cali.fs"});
+    valid &= append_shader("flat", {"flat.vs", "flat.fs"});
     // used to render printbed
     valid &= append_shader("printbed", { "printbed.vs", "printbed.fs" });
     // used to render options in gcode preview