diff --git a/R/class_queue.R b/R/class_queue.R
index 810e384f..4dad8e9a 100644
--- a/R/class_queue.R
+++ b/R/class_queue.R
@@ -37,8 +37,6 @@ queue_class <- R6::R6Class(
     },
     append = function(names, ranks = NULL) {
     },
-    append0 = function(name) {
-    },
     increment_ranks = function(names, by) {
     },
     should_dequeue = function() {
diff --git a/R/class_sequential.R b/R/class_sequential.R
index a4c0d2b3..c64f0b05 100644
--- a/R/class_sequential.R
+++ b/R/class_sequential.R
@@ -24,9 +24,6 @@ sequential_class <- R6::R6Class(
     append = function(names, ranks = NULL) {
       self$data <- c(self$data, names)
     },
-    append0 = function(name) {
-      self$data[length(self$data) + 1L] <- name
-    },
     should_dequeue = function() {
       self$is_nonempty()
     },
diff --git a/tests/testthat/test-class_parallel.R b/tests/testthat/test-class_parallel.R
index edb44352..2d208d91 100644
--- a/tests/testthat/test-class_parallel.R
+++ b/tests/testthat/test-class_parallel.R
@@ -214,31 +214,6 @@ tar_test("parallel$append() default ranks", {
   )
 })
 
-tar_test("parallel$append0() something on an empty queue", {
-  q <- parallel_init()
-  q$append0(name = "a")
-  out <- q$data
-  exp <- 0L
-  names(exp) <- "a"
-  expect_identical(out, exp)
-  expect_equal(q$counter$count, 1L)
-  expect_equal(counter_get_names(q$counter), "a")
-})
-
-tar_test("parallel$append0() something on a nonempty queue", {
-  q <- parallel_init(names = c("x", "y"), ranks = c(2L, 3L))
-  q$append0(name = "a")
-  out <- q$data
-  exp <- c(2L, 3L, 0L)
-  names(exp) <- c("x", "y", "a")
-  expect_identical(out, exp)
-  expect_equal(q$counter$count, 3L)
-  expect_equal(
-    sort(counter_get_names(q$counter)),
-    sort(c("a", "x", "y"))
-  )
-})
-
 tar_test("parallel$increment_ranks() elementwise", {
   q <- parallel_init(names = c("x", "y", "z"), ranks = seq_len(3L))
   q$increment_ranks(names = c("y", "z"), by = c(-2L, 2L))
diff --git a/tests/testthat/test-class_sequential.R b/tests/testthat/test-class_sequential.R
index 38440a30..9e7153ef 100644
--- a/tests/testthat/test-class_sequential.R
+++ b/tests/testthat/test-class_sequential.R
@@ -17,12 +17,6 @@ tar_test("sequential$append()", {
   expect_equal(q$data, c("a", "b", "c", "d"))
 })
 
-tar_test("sequential$append0()", {
-  q <- sequential_init(c("a", "b"))
-  q$append0(name = "c")
-  expect_equal(q$data, c("a", "b", "c"))
-})
-
 tar_test("sequential$increment_ranks()", {
   q <- sequential_init(c("a", "b"))
   q$increment_ranks("a", 1L)