diff --git a/chromium_src/python_modules/buildtools/__init__.py b/chromium_src/python_modules/buildtools/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/chromium_src/python_modules/buildtools/checkdeps/__init__.py b/chromium_src/python_modules/buildtools/checkdeps/__init__.py
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/chromium_src/python_modules/buildtools/checkdeps/brave_builddeps.py b/chromium_src/python_modules/buildtools/checkdeps/brave_builddeps.py
new file mode 100644
index 00000000000..053d8b4f339
--- /dev/null
+++ b/chromium_src/python_modules/buildtools/checkdeps/brave_builddeps.py
@@ -0,0 +1,37 @@
+# Copyright (c) 2021 The Brave Authors. All rights reserved.
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this file,
+# You can obtain one at http://mozilla.org/MPL/2.0/.
+"""Modifies DEPS checker to support `brave/chromium_src` overrides."""
+
+import posixpath
+
+from builddeps import DepsBuilder, NormalizePath
+
+
+class BraveDepsBuilder(DepsBuilder):
+  def _ApplyDirectoryRules(self, existing_rules, dir_path_local_abs):
+    directory_rules, excluded_subdirs = super(DepsBuilder,
+                                              self)._ApplyDirectoryRules(
+                                                  existing_rules,
+                                                  dir_path_local_abs)
+
+    dir_path_norm = NormalizePath(dir_path_local_abs)
+    if '/brave/chromium_src' in dir_path_norm:
+      # Append rules from the original `src/...` dir.
+      root_src_dir_path_norm = dir_path_norm.replace('/brave/chromium_src', '',
+                                                     1)
+      directory_rules, _ = super(DepsBuilder, self)._ApplyDirectoryRules(
+          existing_rules, dir_path_local_abs)
+
+      # Add `+src/...` rule.
+      root_src_relative_dir = 'src/' + posixpath.relpath(
+          root_src_dir_path_norm, NormalizePath(self.base_directory))
+      directory_rules.AddRule('+' + root_src_relative_dir,
+                              root_src_relative_dir,
+                              'Src rule for ' + root_src_relative_dir)
+
+    return directory_rules, excluded_subdirs
+
+
+DepsBuilder = BraveDepsBuilder
diff --git a/patches/buildtools-checkdeps-checkdeps.py.patch b/patches/buildtools-checkdeps-checkdeps.py.patch
new file mode 100644
index 00000000000..c2a1d3c9588
--- /dev/null
+++ b/patches/buildtools-checkdeps-checkdeps.py.patch
@@ -0,0 +1,13 @@
+diff --git a/buildtools/checkdeps/checkdeps.py b/buildtools/checkdeps/checkdeps.py
+index 1019914aac41e9f3a029053bb70a8f5137224734..ddb3575be43eb2b679a133b136a7dc5062942c17 100755
+--- a/buildtools/checkdeps/checkdeps.py
++++ b/buildtools/checkdeps/checkdeps.py
+@@ -24,7 +24,7 @@ import cpp_checker
+ import java_checker
+ import results
+ 
+-from builddeps import DepsBuilder
++from buildtools.checkdeps.brave_builddeps import DepsBuilder
+ from rules import Rule, Rules
+ 
+