diff --git a/spec/std/readline_spec.cr b/spec/std/readline_spec.cr
deleted file mode 100644
index 925a13869dc8..000000000000
--- a/spec/std/readline_spec.cr
+++ /dev/null
@@ -1,21 +0,0 @@
-require "spec"
-require "readline"
-
-describe Readline do
-  typeof(Readline.readline)
-  typeof(Readline.readline("Hello", true))
-  typeof(Readline.readline(prompt: "Hello"))
-  typeof(Readline.readline(add_history: false))
-  typeof(Readline.line_buffer)
-  typeof(Readline.point)
-  typeof(Readline.autocomplete { |s| %w(foo bar) })
-
-  it "gets prefix in bytesize between two strings" do
-    Readline.common_prefix_bytesize("", "foo").should eq(0)
-    Readline.common_prefix_bytesize("foo", "").should eq(0)
-    Readline.common_prefix_bytesize("a", "a").should eq(1)
-    Readline.common_prefix_bytesize("open", "operate").should eq(3)
-    Readline.common_prefix_bytesize("operate", "open").should eq(3)
-    Readline.common_prefix_bytesize(["operate", "open", "optional"]).should eq(2)
-  end
-end
diff --git a/src/docs_main.cr b/src/docs_main.cr
index c84fb0ecd71e..cd538a375971 100644
--- a/src/docs_main.cr
+++ b/src/docs_main.cr
@@ -50,7 +50,6 @@ require "./option_parser"
 require "./partial_comparable"
 require "./path"
 require "./random/**"
-require "./readline"
 require "./semantic_version"
 require "./signal"
 require "./string_pool"
diff --git a/src/readline.cr b/src/readline.cr
deleted file mode 100644
index 5bdb803b793a..000000000000
--- a/src/readline.cr
+++ /dev/null
@@ -1,151 +0,0 @@
-@[Link("readline")]
-{% if flag?(:openbsd) %}
-  @[Link("termcap")]
-{% end %}
-lib LibReadline
-  alias Int = LibC::Int
-
-  fun readline(prompt : UInt8*) : UInt8*
-  fun add_history(line : UInt8*)
-  fun rl_bind_key(key : Int, f : Int, Int -> Int) : Int
-  fun rl_unbind_key(key : Int) : Int
-
-  alias CPP = (UInt8*, Int, Int) -> UInt8**
-
-  $rl_attempted_completion_function : CPP
-  $rl_line_buffer : UInt8*
-  $rl_point : Int
-  $rl_done : Int
-end
-
-private def malloc_match(match)
-  match_ptr = LibC.malloc(match.bytesize + 1).as(UInt8*)
-  match_ptr.copy_from(match.to_unsafe, match.bytesize)
-  match_ptr[match.bytesize] = 0_u8
-  match_ptr
-end
-
-module Readline
-  extend self
-
-  alias CompletionProc = String -> Array(String)?
-
-  alias KeyBindingProc = Int32, Int32 -> Int32
-  KeyBindingHandler = ->(count : LibReadline::Int, key : LibReadline::Int) do
-    if (handlers = @@key_bind_handlers) && handlers[key.to_i32]?
-      res = handlers[key].call(count.to_i32, key.to_i32)
-      LibReadline::Int.new(res)
-    else
-      LibReadline::Int.new(1)
-    end
-  end
-
-  def readline(prompt = "", add_history = false)
-    line = LibReadline.readline(prompt)
-    if line
-      LibReadline.add_history(line) if add_history
-      String.new(line).tap { LibC.free(line.as(Void*)) }
-    else
-      nil
-    end
-  end
-
-  def autocomplete(&@@completion_proc : CompletionProc)
-  end
-
-  def line_buffer
-    line = LibReadline.rl_line_buffer
-    return nil unless line
-
-    String.new(line)
-  end
-
-  def point
-    LibReadline.rl_point
-  end
-
-  def bind_key(c : Char, &f : KeyBindingProc)
-    raise ArgumentError.new "Not a valid ASCII character: #{c.inspect}" unless c.ascii?
-
-    handlers = (@@key_bind_handlers ||= {} of LibReadline::Int => KeyBindingProc)
-    handlers[c.ord] = f
-
-    res = LibReadline.rl_bind_key(c.ord, KeyBindingHandler).to_i32
-    raise ArgumentError.new "Invalid key: #{c.inspect}" unless res == 0
-  end
-
-  def unbind_key(c : Char)
-    if (handlers = @@key_bind_handlers) && handlers[c.ord]?
-      handlers.delete(c.ord)
-      res = LibReadline.rl_unbind_key(c.ord).to_i32
-      raise Exception.new "Error unbinding key: #{c.inspect}" unless res == 0
-    else
-      raise KeyError.new "Key not bound: #{c.inspect}"
-    end
-  end
-
-  def done
-    LibReadline.rl_done != 0
-  end
-
-  def done=(val : Bool)
-    LibReadline.rl_done = val.hash
-  end
-
-  # :nodoc:
-  def common_prefix_bytesize(str1 : String, str2 : String)
-    r1 = Char::Reader.new str1
-    r2 = Char::Reader.new str2
-
-    while r1.has_next? && r2.has_next?
-      break if r1.current_char != r2.current_char
-
-      r1.next_char
-      r2.next_char
-    end
-
-    r1.pos
-  end
-
-  # :nodoc:
-  def common_prefix_bytesize(strings : Array)
-    str1 = strings[0]
-    low = str1.bytesize
-    1.upto(strings.size - 1).each do |i|
-      str2 = strings[i]
-      low2 = common_prefix_bytesize(str1, str2)
-      low = low2 if low2 < low
-    end
-    low
-  end
-
-  LibReadline.rl_attempted_completion_function = ->(text_ptr, start, finish) {
-    completion_proc = @@completion_proc
-    return Pointer(UInt8*).null unless completion_proc
-
-    text = String.new(text_ptr)
-    matches = completion_proc.call(text)
-
-    return Pointer(UInt8*).null unless matches
-    return Pointer(UInt8*).null if matches.empty?
-
-    # We *must* to create the results using malloc (readline later frees that).
-    # We create an extra result for the first element.
-    result = LibC.malloc(sizeof(UInt8*) * (matches.size + 2)).as(UInt8**)
-    matches.each_with_index do |match, i|
-      result[i + 1] = malloc_match(match)
-    end
-    result[matches.size + 1] = Pointer(UInt8).null
-
-    # The first element is the completion if it's oe
-    if matches.size == 1
-      result[0] = malloc_match(matches[0])
-    else
-      # Otherwise, we compute the common prefix of all matches
-      low = Readline.common_prefix_bytesize(matches)
-      sub = matches[0].byte_slice(0, low)
-      result[0] = malloc_match(sub)
-    end
-    result
-  }
-end