diff --git a/docs/mirrors.md b/docs/mirrors.md
index 47d86563..c22a16d3 100644
--- a/docs/mirrors.md
+++ b/docs/mirrors.md
@@ -10,15 +10,22 @@ Find the currently selected mirrors in the output of `pmbootstrap status`, as we
 
 ## Advanced
 
-Some advanced use cases are supported by configuring the mirrors directly, either by editing
-`pmbootstrap_v3.cfg` or running `pmbootstrap config`. Find the lists of mirrors at
-[mirrors.alpinelinux.org](https://mirrors.alpinelinux.org) and
+Some advanced use cases are supported by configuring the mirrors directly, either by running the
+non-interactive `pmbootstrap config` command or by editing `pmbootstrap_v3.cfg`. Find the lists of
+mirrors at [mirrors.alpinelinux.org](https://mirrors.alpinelinux.org) and
 [mirrors.postmarketos.org](https://mirrors.postmarketos.org).
 
-### Change the Alpine Linux mirror
+### Change the mirrors non-interactively
 
 ```
 $ pmbootstrap config mirrors.alpine http://uk.alpinelinux.org/alpine/
+$ pmbootstrap config mirrors.pmaports http://postmarketos.craftyguy.net/
+```
+
+Reset to default works as with all config options:
+```
+$ pmbootstrap config -r mirrors.alpine
+$ pmbootstrap config -r mirrors.pmaports
 ```
 
 ### Disable the postmarketOS mirror
diff --git a/pmb/helpers/args.py b/pmb/helpers/args.py
index 9dbae07b..de065d47 100644
--- a/pmb/helpers/args.py
+++ b/pmb/helpers/args.py
@@ -75,14 +75,6 @@ def init(args: PmbArgs) -> PmbArgs:
         if hasattr(args, key):
             delattr(args, key)
 
-    # Handle --mirror-alpine and --mirror-pmos
-    value = getattr(args, "mirror_alpine", None)
-    if value:
-        config.mirrors["alpine"] = value
-    value = getattr(args, "mirror_postmarketos", None)
-    if value:
-        config.mirrors["pmaports"] = value
-
     # Configure runtime context
     context = Context(config)
     context.command_timeout = args.timeout
diff --git a/pmb/parse/arguments.py b/pmb/parse/arguments.py
index 36ea2fa8..bc4e4bbe 100644
--- a/pmb/parse/arguments.py
+++ b/pmb/parse/arguments.py
@@ -8,6 +8,7 @@ import sys
 from pmb.core.arch import Arch
 from pmb.core import Config
 from pmb.types import PmbArgs
+from pmb.helpers.exceptions import NonBugError
 
 try:
     import argcomplete  # type:ignore[import-untyped]
@@ -806,9 +807,6 @@ def get_parser():
     parser = argparse.ArgumentParser(prog="pmbootstrap")
     arch_native = Arch.native()
     arch_choices = Arch.supported()
-    # FIXME: we should load the real config instead here
-    default_config = Config()
-    mirrors_pmos_default = default_config.mirrors["pmaports"]
 
     # Other
     parser.add_argument("-V", "--version", action="version", version=pmb.__version__)
@@ -823,20 +821,15 @@ def get_parser():
     parser.add_argument(
         "-mp",
         "--mirror-pmOS",
-        dest="mirror_postmarketos",
-        help="postmarketOS mirror, disable with: -mp='',"
-        " specify multiple with: -mp='one' -mp='two',"
-        f" default: {mirrors_pmos_default}",
-        metavar="URL",
+        dest="deprecated_mp",
+        help=argparse.SUPPRESS,
         action="append",
-        default=[],
     )
     parser.add_argument(
         "-m",
         "--mirror-alpine",
-        dest="mirror_alpine",
-        help="Alpine Linux mirror, default: " f"{default_config.mirrors['alpine']}",
-        metavar="URL",
+        dest="deprecated_m",
+        help=argparse.SUPPRESS,
     )
     parser.add_argument("-j", "--jobs", help="parallel jobs when compiling")
     parser.add_argument(
@@ -1287,6 +1280,12 @@ def arguments():
 
     pmb.helpers.args.init(args)
 
+    if getattr(args, "deprecated_mp", None) or getattr(args, "deprecated_m", None):
+        raise NonBugError(
+            "Arguments --mirror-pmOS and --mirror-alpine have been removed. See docs/mirrors.md"
+            " regarding how to set mirrors now."
+        )
+
     if getattr(args, "go_mod_cache", None) is None:
         gomodcache = True if getattr(args, "src", None) else False
         setattr(args, "go_mod_cache", gomodcache)