diff --git a/Chapter_6/Example_6_3/Example_6_3.c b/Chapter_6/Example_6_3/Example_6_3.c
index a5bbd05..a26ac77 100644
--- a/Chapter_6/Example_6_3/Example_6_3.c
+++ b/Chapter_6/Example_6_3/Example_6_3.c
@@ -117,7 +117,7 @@ void Draw ( ESContext *esContext )
 
    glDrawArrays ( GL_TRIANGLES, 0, 3 );
 
-   glDisableVertexAttribArray ( 1 );
+   glDisableVertexAttribArray ( 0 );
 }
 
 void Shutdown ( ESContext *esContext )