diff --git a/docs/source/command_line.rst b/docs/source/command_line.rst
index b455e287017e..98a2a927689b 100644
--- a/docs/source/command_line.rst
+++ b/docs/source/command_line.rst
@@ -754,9 +754,6 @@ of the above sections.
     strict will catch type errors as long as intentional methods like type ignore
     or casting were not used.)
 
-    Note: the :option:`--warn-unreachable` flag
-    is not automatically enabled by the strict flag.
-
     The strict flag does not take precedence over other strict-related flags.
     Directly specifying a flag of alternate behavior will override the
     behavior of strict, regardless of the order in which they are passed.
diff --git a/mypy/main.py b/mypy/main.py
index 7bd7215bbe2a..1aeb78842468 100644
--- a/mypy/main.py
+++ b/mypy/main.py
@@ -825,7 +825,7 @@ def add_invertible_flag(
     add_invertible_flag(
         "--warn-unreachable",
         default=False,
-        strict_flag=False,
+        strict_flag=True,
         help="Warn about statements or expressions inferred to be unreachable",
         group=lint_group,
     )
diff --git a/mypy_self_check.ini b/mypy_self_check.ini
index 816e6321c06f..8b38cf7534a0 100644
--- a/mypy_self_check.ini
+++ b/mypy_self_check.ini
@@ -13,7 +13,3 @@ exclude = mypy/typeshed/|mypyc/test-data/|mypyc/lib-rt/
 enable_error_code = ignore-without-code,redundant-expr
 enable_incomplete_feature = PreciseTupleTypes
 show_error_code_links = True
-
-[mypy-mypy.*]
-# TODO: enable for `mypyc` and other files as well
-warn_unreachable = True