diff --git a/R/db_timestamps.R b/R/db_timestamps.R
index 02a4cc0e..1c21fdbd 100644
--- a/R/db_timestamps.R
+++ b/R/db_timestamps.R
@@ -22,7 +22,6 @@ db_timestamp.default <- function(timestamp, conn) {
   return(dbplyr::translate_sql(as.POSIXct(!!timestamp), con = conn))
 }
 
-#' @rdname db_timestamp
 #' @export
 db_timestamp.NULL <- function(timestamp, conn) {
   if (inherits(timestamp, "POSIXt")) timestamp <- format(timestamp)
diff --git a/man/db_timestamp.Rd b/man/db_timestamp.Rd
index 08a78617..5f72b044 100644
--- a/man/db_timestamp.Rd
+++ b/man/db_timestamp.Rd
@@ -3,7 +3,6 @@
 \name{db_timestamp}
 \alias{db_timestamp}
 \alias{db_timestamp.default}
-\alias{db_timestamp.NULL}
 \alias{db_timestamp.SQLiteConnection}
 \title{Determine the type of timestamps the DB supports}
 \usage{
@@ -11,8 +10,6 @@ db_timestamp(timestamp, conn = NULL)
 
 \method{db_timestamp}{default}(timestamp, conn)
 
-\method{db_timestamp}{`NULL`}(timestamp, conn)
-
 \method{db_timestamp}{SQLiteConnection}(timestamp, conn)
 }
 \arguments{