diff --git a/R/recipe.R b/R/recipe.R
index e668e6607..949711521 100644
--- a/R/recipe.R
+++ b/R/recipe.R
@@ -209,6 +209,14 @@ recipe.formula <- function(formula, data, ...) {
     cli::cli_abort("{.arg data} is missing with no default.")
   }
 
+  if (is.table(data)) {
+    cli::cli_warn(
+      "Passing a table to {.fn recipe} is undocumented unsupported behavior.
+      This will no longer be possible in the next release of {.pkg recipes}."
+    )
+    data <- as_tibble(data)
+  }
+
   if (!is.data.frame(data) && !is.matrix(data) && !is_sparse_matrix(data)) {
     cli::cli_abort(
       "{.arg data} must be a data frame, matrix, or sparse matrix,