diff --git a/BaseGLProject/light.vert b/BaseGLProject/light.vert
index 2bbdae2..3b9bb93 100644
--- a/BaseGLProject/light.vert
+++ b/BaseGLProject/light.vert
@@ -35,7 +35,7 @@ void main(void)
 
 	vec3 diffuse = Kd * Ld * max(dot(L, N), 0.0);
 	vec3 ambient = Ka * La;
-	vec3 specular = Ks * Ls * pow(max(dot(L, N), 0.0), 50.0);
+	vec3 specular = Ks * Ls * pow(max(dot(R, V), 0.0), 50.0);
 
 	f_color = diffuse + ambient + specular;
 	gl_Position = mvp * vec4(coord3d, 1.0f);