diff --git a/demos/assets/shaders/base.vp b/demos/assets/shaders/base.vp
index b054d8e..6c4c183 100644
--- a/demos/assets/shaders/base.vp
+++ b/demos/assets/shaders/base.vp
@@ -99,7 +99,7 @@ void main() {
         uv = tex_coords * uv_transform.zw + uv_transform.xy;
     #endif
 	
-	color = vcolor * 2;
+	color = vcolor * 2.0;
     
 	gl_Position = vec4(position.xy,depth,1.0);