diff --git a/src/4.advanced_opengl/9.3.geometry_shader_normals/9.3.normal_visualization.gs b/src/4.advanced_opengl/9.3.geometry_shader_normals/9.3.normal_visualization.gs
index 1bea216..a1b6607 100644
--- a/src/4.advanced_opengl/9.3.geometry_shader_normals/9.3.normal_visualization.gs
+++ b/src/4.advanced_opengl/9.3.geometry_shader_normals/9.3.normal_visualization.gs
@@ -8,11 +8,13 @@ in VS_OUT {
 
 const float MAGNITUDE = 0.2;
 
+uniform mat4 projection;
+
 void GenerateLine(int index)
 {
-    gl_Position = gl_in[index].gl_Position;
+    gl_Position = projection * gl_in[index].gl_Position;
     EmitVertex();
-    gl_Position = gl_in[index].gl_Position + vec4(gs_in[index].normal, 0.0) * MAGNITUDE;
+    gl_Position = projection * (gl_in[index].gl_Position + vec4(gs_in[index].normal, 0.0) * MAGNITUDE);
     EmitVertex();
     EndPrimitive();
 }
diff --git a/src/4.advanced_opengl/9.3.geometry_shader_normals/9.3.normal_visualization.vs b/src/4.advanced_opengl/9.3.geometry_shader_normals/9.3.normal_visualization.vs
index 5cf6e44..1adefa7 100644
--- a/src/4.advanced_opengl/9.3.geometry_shader_normals/9.3.normal_visualization.vs
+++ b/src/4.advanced_opengl/9.3.geometry_shader_normals/9.3.normal_visualization.vs
@@ -6,13 +6,12 @@ out VS_OUT {
     vec3 normal;
 } vs_out;
 
-uniform mat4 projection;
 uniform mat4 view;
 uniform mat4 model;
 
 void main()
 {
     mat3 normalMatrix = mat3(transpose(inverse(view * model)));
-    vs_out.normal = vec3(projection * vec4(normalMatrix * aNormal, 0.0));
-    gl_Position = projection * view * model * vec4(aPos, 1.0); 
+    vs_out.normal = vec3(vec4(normalMatrix * aNormal, 0.0));
+    gl_Position = view * model * vec4(aPos, 1.0); 
 }
\ No newline at end of file