diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0fbff89e..a2c9a8a5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,8 @@
 All notable changes to this project will be documented in this file.
 
 ## 0.4.0 - ??
+- Remove `tuple/append` and `tuple/prepend`, which may have seened like `O(1)`
+  operations. Instead, use the `splice` special to extend tuples.
 - Add `-m` flag to main client to allow specifying where to load
   system modules from.
 - Add `-c` flag to main client to allow compiling Janet modules to images.
diff --git a/src/core/core.janet b/src/core/core.janet
index 0194dbc0..3e1bc582 100644
--- a/src/core/core.janet
+++ b/src/core/core.janet
@@ -311,7 +311,7 @@
     [i preds &]
     (default preds @['and])
     (if (>= i len)
-      (tuple/prepend body 'do)
+      ['do ;body]
       (do
         (def {i bindings
               (+ i 1) verb
diff --git a/src/core/tuple.c b/src/core/tuple.c
index cbcd28d5..8af69092 100644
--- a/src/core/tuple.c
+++ b/src/core/tuple.c
@@ -106,26 +106,6 @@ static Janet cfun_tuple_slice(int32_t argc, Janet *argv) {
     return janet_wrap_tuple(janet_tuple_n(view.items + range.start, range.end - range.start));
 }
 
-static Janet cfun_tuple_prepend(int32_t argc, Janet *argv) {
-    janet_arity(argc, 1, -1);
-    JanetView view = janet_getindexed(argv, 0);
-    Janet *n = janet_tuple_begin(view.len - 1 + argc);
-    memcpy(n - 1 + argc, view.items, sizeof(Janet) * view.len);
-    for (int32_t i = 1; i < argc; i++) {
-        n[argc - i - 1] = argv[i];
-    }
-    return janet_wrap_tuple(janet_tuple_end(n));
-}
-
-static Janet cfun_tuple_append(int32_t argc, Janet *argv) {
-    janet_arity(argc, 1, -1);
-    JanetView view = janet_getindexed(argv, 0);
-    Janet *n = janet_tuple_begin(view.len - 1 + argc);
-    memcpy(n, view.items, sizeof(Janet) * view.len);
-    memcpy(n + view.len, argv + 1, sizeof(Janet) * (argc - 1));
-    return janet_wrap_tuple(janet_tuple_end(n));
-}
-
 static Janet cfun_tuple_type(int32_t argc, Janet *argv) {
     janet_fixarity(argc, 1);
     const Janet *tup = janet_gettuple(argv, 0);
@@ -150,19 +130,6 @@ static const JanetReg tuple_cfuns[] = {
              "they default to 0 and the length of arrtup respectively."
              "Returns the new tuple.")
     },
-    {
-        "tuple/append", cfun_tuple_append,
-        JDOC("(tuple/append tup & items)\n\n"
-             "Returns a new tuple that is the result of appending "
-             "each element in items to tup.")
-    },
-    {
-        "tuple/prepend", cfun_tuple_prepend,
-        JDOC("(tuple/prepend tup & items)\n\n"
-             "Prepends each element in items to tuple and "
-             "returns a new tuple. Items are prepended such that the "
-             "last element in items is the first element in the new tuple.")
-    },
     {
         "tuple/type", cfun_tuple_type,
         JDOC("(tuple/type tup)\n\n"
diff --git a/test/suite1.janet b/test/suite1.janet
index f86ddf33..a48d30df 100644
--- a/test/suite1.janet
+++ b/test/suite1.janet
@@ -97,8 +97,8 @@
 # of the triangle to the leaves of the triangle.
 
 (defn myfold [xs ys]
-  (let [xs1 (tuple/prepend xs 0)
-        xs2 (tuple/append xs 0)
+  (let [xs1 [;xs 0]
+        xs2 [0 ;xs]
         m1 (map + xs1 ys)
         m2 (map + xs2 ys)]
     (map max m1 m2)))
@@ -178,7 +178,7 @@
 # Large functions
 (def manydefs (seq [i :range [0 300]] (tuple 'def (gensym) (string "value_" i))))
 (array/push manydefs (tuple * 10000 3 5 7 9))
-(def f (compile (tuple/prepend manydefs 'do) *env*))
+(def f (compile ['do ;manydefs] *env*))
 (assert (= (f) (* 10000 3 5 7 9)) "long function compilation")
 
 # Some higher order functions and macros