diff --git a/R/scroll_box.R b/R/scroll_box.R
index 9cf85d3..44bd096 100644
--- a/R/scroll_box.R
+++ b/R/scroll_box.R
@@ -29,5 +29,6 @@
   out <- structure(out, format = "html",
                    class = "knitr_kable")
   attributes(out) <- kable_attrs
+  if (!"kableExtra" %in% class(out)) class(out) <- c("kableExtra", class(out))
   return(out)
 }