diff --git a/QtMeshViewer/Resources/fshader.glsl b/QtMeshViewer/Resources/fshader.glsl
index f855a85..1d9163e 100644
--- a/QtMeshViewer/Resources/fshader.glsl
+++ b/QtMeshViewer/Resources/fshader.glsl
@@ -15,7 +15,7 @@ uniform struct Light {
 uniform bool b_transparent;
 
 varying vec2 v_texcoord;
-varying vec4 v_position;
+varying vec3 v_position;
 varying vec3 v_normal;
 
 void main()