diff --git a/lib/ansible/cli/doc.py b/lib/ansible/cli/doc.py
index 8454af29e39..f0afda8de5f 100644
--- a/lib/ansible/cli/doc.py
+++ b/lib/ansible/cli/doc.py
@@ -61,8 +61,6 @@ class DocCLI(CLI):
                                help='List available plugins')
         self.parser.add_option("-s", "--snippet", action="store_true", default=False, dest='show_snippet',
                                help='Show playbook snippet for specified plugin(s)')
-        self.parser.add_option("-a", "--all", action="store_true", default=False, dest='all_plugins',
-                               help='**For internal testing only** Show documentation for all plugins.')
         self.parser.add_option("-j", "--json", action="store_true", default=False, dest='json_dump',
                                help='**For internal testing only** Dump json metadata for all plugins.')
         self.parser.add_option("-t", "--type", action="store", default='module', dest='type', type='choice',
@@ -73,17 +71,11 @@ class DocCLI(CLI):
     def post_process_args(self, options, args):
         options, args = super(DocCLI, self).post_process_args(options, args)
 
-        if [options.all_plugins, options.json_dump, options.list_dir, options.list_files, options.show_snippet].count(True) > 1:
-            raise AnsibleOptionsError("Only one of -l, -F, -s, -j or -a can be used at the same time.")
+        if [options.json_dump, options.list_dir, options.list_files, options.show_snippet].count(True) > 1:
+            raise AnsibleOptionsError("Only one of -l, -F, -s, or -j can be used at the same time.")
 
         display.verbosity = options.verbosity
 
-        # process all plugins of type
-        if options.all_plugins:
-            args = self.get_all_plugins_of_type(options.type)
-            if options.module_path:
-                display.warning('Ignoring "--module-path/-M" option as "--all/-a" only displays builtins')
-
         return options, args
 
     def run(self):
diff --git a/test/units/cli/test_doc.py b/test/units/cli/test_doc.py
deleted file mode 100644
index eb117dc56d9..00000000000
--- a/test/units/cli/test_doc.py
+++ /dev/null
@@ -1,12 +0,0 @@
-# Copyright: (c) 2019, Ansible Project
-# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
-
-from __future__ import (absolute_import, division, print_function)
-__metaclass__ = type
-
-from ansible.cli.doc import DocCLI
-
-
-def test_parsing_all_option():
-    doc_cli = DocCLI(['/n/ansible-doc', '-a'])
-    doc_cli.parse()