diff --git a/NAMESPACE b/NAMESPACE
index ce169c8..c2b2384 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -50,7 +50,6 @@ export(gsub_files)
 export(in_dir)
 export(install_dir)
 export(install_github)
-export(isFALSE)
 export(is_CRAN_incoming)
 export(is_R_CMD_check)
 export(is_abs_path)
diff --git a/R/utils.R b/R/utils.R
index 5f39d58..c77f757 100644
--- a/R/utils.R
+++ b/R/utils.R
@@ -100,7 +100,6 @@ in_dir = function(dir, expr) {
 #'   use \code{base::\link[base]{isFALSE}()} instead. If you have to support R
 #'   versions lower than 3.5.0, you may use \code{identical(x, FALSE)}, but
 #'   please note that it is not equivalent to \code{base::isFALSE()}.
-#' @export
 #' @examples
 #' library(xfun)
 #' isFALSE(TRUE)  # false