diff --git a/doc/changes/8611.md b/doc/changes/8611.md
new file mode 100644
index 00000000000..c34d37aaae7
--- /dev/null
+++ b/doc/changes/8611.md
@@ -0,0 +1,2 @@
+- Remove warning against `.dune` files generated by pre dune 2.0 (#8611,
+  @rgrinberg)
diff --git a/src/dune_rules/findlib.ml b/src/dune_rules/findlib.ml
index e5600f52e59..35776f48cd4 100644
--- a/src/dune_rules/findlib.ml
+++ b/src/dune_rules/findlib.ml
@@ -64,22 +64,6 @@ let hash { stdlib_dir; paths; builtins; ext_lib } =
 
 let findlib_predicates_set_by_dune = Ps.of_list [ P.ppx_driver; P.mt; P.mt_posix ]
 
-let check_dot_dune_exists ~dir ~dir_contents name =
-  match dir_contents with
-  | Error _ -> ()
-  | Ok fnames ->
-    let fname = sprintf "%s.dune" (Lib_name.to_string name) in
-    if List.mem fnames fname ~equal:String.equal
-    then
-      User_warning.emit
-        ~loc:(Loc.in_file (Path.relative dir fname))
-        [ Pp.text
-            ".dune files are ignored since 2.0. Reinstall the library with dune >= 2.0 \
-             to get rid of this warning and enable support for the subsystem this \
-             library provides."
-        ]
-;;
-
 let has_double_underscore s =
   let len = String.length s in
   len >= 2
@@ -98,7 +82,6 @@ let has_double_underscore s =
 let to_dune_library (t : Findlib.Package.t) ~dir_contents ~ext_lib =
   let loc = Loc.in_file t.meta_file in
   let add_loc x = loc, x in
-  check_dot_dune_exists ~dir:t.dir ~dir_contents t.name;
   let archives = Findlib.Package.archives t in
   let obj_dir = Obj_dir.make_external_no_private ~dir:t.dir in
   let modes : Lib_mode.Map.Set.t =
diff --git a/test/blackbox-tests/test-cases/old-dune-subsystem.t/example/dune-project b/test/blackbox-tests/test-cases/old-dune-subsystem.t/example/dune-project
deleted file mode 100644
index 81c449d2edc..00000000000
--- a/test/blackbox-tests/test-cases/old-dune-subsystem.t/example/dune-project
+++ /dev/null
@@ -1 +0,0 @@
-(lang dune 1.5)
diff --git a/test/blackbox-tests/test-cases/old-dune-subsystem.t/example/src/dune b/test/blackbox-tests/test-cases/old-dune-subsystem.t/example/src/dune
deleted file mode 100644
index 34b65e983ac..00000000000
--- a/test/blackbox-tests/test-cases/old-dune-subsystem.t/example/src/dune
+++ /dev/null
@@ -1,3 +0,0 @@
-(library
-  (name example)
-  (inline_tests (backend dune_inline_tests)))
\ No newline at end of file
diff --git a/test/blackbox-tests/test-cases/old-dune-subsystem.t/example/src/x.ml b/test/blackbox-tests/test-cases/old-dune-subsystem.t/example/src/x.ml
deleted file mode 100644
index e69de29bb2d..00000000000
diff --git a/test/blackbox-tests/test-cases/old-dune-subsystem.t/install/lib/dune_inline_tests/META b/test/blackbox-tests/test-cases/old-dune-subsystem.t/install/lib/dune_inline_tests/META
deleted file mode 100644
index c72b99109fc..00000000000
--- a/test/blackbox-tests/test-cases/old-dune-subsystem.t/install/lib/dune_inline_tests/META
+++ /dev/null
@@ -1,6 +0,0 @@
-description = ""
-requires = ""
-archive(byte) = "simple_tests.cma"
-archive(native) = "simple_tests.cmxa"
-plugin(byte) = "simple_tests.cma"
-plugin(native) = "simple_tests.cmxs"
\ No newline at end of file
diff --git a/test/blackbox-tests/test-cases/old-dune-subsystem.t/install/lib/dune_inline_tests/dune_inline_tests.dune b/test/blackbox-tests/test-cases/old-dune-subsystem.t/install/lib/dune_inline_tests/dune_inline_tests.dune
deleted file mode 100644
index 7d8c5a03145..00000000000
--- a/test/blackbox-tests/test-cases/old-dune-subsystem.t/install/lib/dune_inline_tests/dune_inline_tests.dune
+++ /dev/null
@@ -1,7 +0,0 @@
-(dune
- 2
- ((inline_tests.backend
-   1.0
-   ((flags :standard)
-    (generate_runner
-     (run sed "s/(\\*TEST:\\(.*\\)\\*)/let () = \\1;;/" %{impl-files}))))))
\ No newline at end of file
diff --git a/test/blackbox-tests/test-cases/old-dune-subsystem.t/run.t b/test/blackbox-tests/test-cases/old-dune-subsystem.t/run.t
deleted file mode 100644
index cc30e824df1..00000000000
--- a/test/blackbox-tests/test-cases/old-dune-subsystem.t/run.t
+++ /dev/null
@@ -1,17 +0,0 @@
-install/lib contains inline tests as defined with the old subsystem. Previously,
-#1549 would do the same thing, but it would generate the configuration. Since
-new versions of dune will generate dune-package files, we should still make sure
-we understand the old files.
-
-  $ env OCAMLPATH=install/lib dune runtest --root example
-  Entering directory 'example'
-  File "$TESTCASE_ROOT/install/lib/dune_inline_tests/dune_inline_tests.dune", line 1, characters 0-0:
-  Warning: .dune files are ignored since 2.0. Reinstall the library with dune
-  >= 2.0 to get rid of this warning and enable support for the subsystem this
-  library provides.
-  File "src/dune", line 3, characters 25-42:
-  3 |   (inline_tests (backend dune_inline_tests)))
-                               ^^^^^^^^^^^^^^^^^
-  Error: dune_inline_tests is not an inline tests backend
-  Leaving directory 'example'
-  [1]