diff --git a/NAMESPACE b/NAMESPACE
index e804ca8..810b751 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -8,6 +8,7 @@ S3method(as.Configuration,ppp)
 S3method(as.Window,Window)
 S3method(as.Window,im)
 S3method(as.Window,owin)
+S3method(as.data.frame,Configuration)
 S3method(as.owin,Disk_window)
 S3method(as.owin,Rectangle_window_union)
 S3method(as.ppp,Configuration)
diff --git a/R/Configuration.R b/R/Configuration.R
index d7d4882..e51c511 100644
--- a/R/Configuration.R
+++ b/R/Configuration.R
@@ -301,7 +301,7 @@ marks.Configuration <- function(x, ...) {
 #'
 #' @param x Configuration.
 #' @param ... Unused.
-#' @exportS3Method as.data.frame Configuration
+#' @method as.data.frame Configuration
 #' @examples
 #' set.seed(1)
 #'
@@ -311,6 +311,7 @@ marks.Configuration <- function(x, ...) {
 #' # Convert it to a data.frame
 #' print(as.data.frame(configuration))
 #'
+#' @export
 as.data.frame.Configuration <- function(x, ...) {
   data.frame(x = x$x,
              y = x$y,