diff --git a/NAMESPACE b/NAMESPACE
index 1d9eec61..85d6dff7 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -43,6 +43,7 @@ S3method(print_md,estimate_predicted)
 S3method(print_md,estimate_slopes)
 S3method(print_md,estimate_smooth)
 S3method(print_md,visualisation_matrix)
+S3method(reshape_grouplevel,data.frame)
 S3method(reshape_grouplevel,estimate_grouplevel)
 S3method(smoothing,data.frame)
 S3method(smoothing,numeric)
diff --git a/R/reshape_grouplevel.R b/R/reshape_grouplevel.R
index 9893de63..07bb2271 100644
--- a/R/reshape_grouplevel.R
+++ b/R/reshape_grouplevel.R
@@ -78,3 +78,6 @@ reshape_grouplevel.estimate_grouplevel <- function(x, indices = "all", group = "
   class(data) <- c("reshape_grouplevel", class(data))
   data
 }
+
+#' @export
+reshape_grouplevel.data.frame <- reshape_grouplevel.estimate_grouplevel