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<?php
if ( ! function_exists( 'woocommerce_template_loop_add_to_cart' ) ) {

  function woocommerce_template_loop_add_to_cart() {
    global $product;

    if ($product->product_type == "variable" && (is_product() || is_product_category() || is_product_tag())) {
      woocommerce_variable_add_to_cart();
    }
    else {
      woocommerce_get_template( 'loop/add-to-cart.php' );
    }
  }

}
?>