diff --git a/R/add_indent.R b/R/add_indent.R
index a0cb37f..8dc2d4d 100644
--- a/R/add_indent.R
+++ b/R/add_indent.R
@@ -87,5 +87,6 @@
   }
   out <- as_kable_xml(kable_xml)
   attributes(out) <- kable_attrs
+  if (!"kableExtra" %in% class(out)) class(out) <- c("kableExtra", class(out))
   return(out)
 }