diff --git a/resources/shaders/110/thumbnail.vs b/resources/shaders/110/thumbnail.vs
index a9a3c984b2..aa718b0067 100644
--- a/resources/shaders/110/thumbnail.vs
+++ b/resources/shaders/110/thumbnail.vs
@@ -14,15 +14,14 @@ const vec3 LIGHT_FRONT_DIR = vec3(0.6985074, 0.1397015, 0.6985074);
 
 #define INTENSITY_AMBIENT    0.3
 
-attribute vec3 v_position;
-attribute vec3 v_normal;
-
 uniform mat4 view_model_matrix;
 uniform mat4 projection_matrix;
 uniform mat3 normal_matrix;
-
 uniform mat4 volume_world_matrix;
 
+attribute vec3 v_position;
+attribute vec3 v_normal;
+
 // x = tainted, y = specular;
 varying vec2 intensity;
 varying vec4 world_pos;
@@ -45,7 +44,7 @@ void main()
     intensity.x += NdotL * LIGHT_FRONT_DIFFUSE;
 
     // Point in homogenous coordinates.
-    world_pos = volume_world_matrix * gl_Vertex;
+    world_pos = volume_world_matrix * vec4(v_position, 1.0);
 
     gl_Position = projection_matrix * position;
 }
diff --git a/resources/shaders/140/thumbnail.vs b/resources/shaders/140/thumbnail.vs
index d7996d99c9..19e40c614a 100644
--- a/resources/shaders/140/thumbnail.vs
+++ b/resources/shaders/140/thumbnail.vs
@@ -14,15 +14,14 @@ const vec3 LIGHT_FRONT_DIR = vec3(0.6985074, 0.1397015, 0.6985074);
 
 #define INTENSITY_AMBIENT    0.3
 
-in vec3 v_position;
-in vec3 v_normal;
-
 uniform mat4 view_model_matrix;
 uniform mat4 projection_matrix;
 uniform mat3 normal_matrix;
-
 uniform mat4 volume_world_matrix;
 
+in vec3 v_position;
+in vec3 v_normal;
+
 // x = tainted, y = specular;
 out vec2 intensity;
 out vec4 world_pos;
@@ -45,7 +44,7 @@ void main()
     intensity.x += NdotL * LIGHT_FRONT_DIFFUSE;
 
     // Point in homogenous coordinates.
-    world_pos = volume_world_matrix * gl_Vertex;
+    world_pos = volume_world_matrix * vec4(v_position, 1.0);
 
     gl_Position = projection_matrix * position;
 }