diff --git a/WFObj.cc b/WFObj.cc
index 23090d2..e5b3e74 100644
--- a/WFObj.cc
+++ b/WFObj.cc
@@ -536,9 +536,11 @@ bool WFObj::buildVBO()
     glGenBuffers(1, &m_data_vbo);
     glGenBuffers(1, &m_index_vbo);
     /* move data from client side to GL */
-    glBufferData(m_data_vbo, sizeof(GLfloat) * n_data_elements, data,
+    glBindBuffer(GL_ARRAY_BUFFER, m_data_vbo);
+    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_index_vbo);
+    glBufferData(GL_ARRAY_BUFFER, sizeof(GLfloat) * n_data_elements, data,
             GL_STATIC_DRAW);
-    glBufferData(m_index_vbo, sizeof(GLshort) * n_vrefs, indices,
+    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(GLshort) * n_vrefs, indices,
             GL_STATIC_DRAW);
     delete[] data;
     delete[] indices;