diff --git a/src/com/homelinux/holtrop/opengltest/MyRenderer.java b/src/com/homelinux/holtrop/opengltest/MyRenderer.java
index 0654554..38e1455 100644
--- a/src/com/homelinux/holtrop/opengltest/MyRenderer.java
+++ b/src/com/homelinux/holtrop/opengltest/MyRenderer.java
@@ -100,8 +100,10 @@ public class MyRenderer implements GLSurfaceView.Renderer
         GLES20.glEnableVertexAttribArray(attr_pos);
         GLES20.glEnableVertexAttribArray(attr_color);
         checkGLError("glEnableVertexAttribArray");
+        m_quad_attrib_buffer.position(0);
         GLES20.glVertexAttribPointer(attr_pos, 3, GLES20.GL_FLOAT, false,
                 6 * 4, m_quad_attrib_buffer);
+        m_quad_attrib_buffer.position(3);
         GLES20.glVertexAttribPointer(attr_color, 3, GLES20.GL_FLOAT, false,
                 6 * 4, m_quad_attrib_buffer);
         checkGLError("glVertexAttribPointer");