diff --git a/presubmit_canned_checks.py b/presubmit_canned_checks.py
index 3f7ac0cddf..213ba33051 100644
--- a/presubmit_canned_checks.py
+++ b/presubmit_canned_checks.py
@@ -2130,11 +2130,15 @@ def CheckInclusiveLanguage(input_api, output_api,
     ]
 
   # Note that this matches exact path prefixes, and does not match
-  # subdirectories. Only files directly in an exlcluded path will
+  # subdirectories. Only files directly in an excluded path will
   # match.
   def IsExcludedFile(affected_file, excluded_paths):
     local_dir = input_api.os_path.dirname(affected_file.LocalPath())
 
+    # Excluded paths use forward slashes.
+    if input_api.platform == 'win32':
+      local_dir = local_dir.replace('\\', '/')
+
     return local_dir in excluded_paths
 
   def CheckForMatch(affected_file, line_num, line, term, message, error):
diff --git a/tests/presubmit_canned_checks_test.py b/tests/presubmit_canned_checks_test.py
index a03e640a16..cee18da784 100644
--- a/tests/presubmit_canned_checks_test.py
+++ b/tests/presubmit_canned_checks_test.py
@@ -29,8 +29,8 @@ class InclusiveLanguageCheckTest(unittest.TestCase):
         MockFile(
             os.path.normpath(
                 'infra/inclusive_language_presubmit_exempt_dirs.txt'), [
-                    os.path.normpath('some/dir') + ' 2 1',
-                    os.path.normpath('some/other/dir') + ' 2 1',
+                    'some/dir 2 1',
+                    'some/other/dir 2 1',
                 ]),
         MockFile(
             os.path.normpath('some/ios/file.mm'),
@@ -133,8 +133,8 @@ class InclusiveLanguageCheckTest(unittest.TestCase):
         MockFile(
             os.path.normpath(
                 'infra/inclusive_language_presubmit_exempt_dirs.txt'), [
-                    os.path.normpath('some/ios') + ' 2 1',
-                    os.path.normpath('some/other/dir') + ' 2 1',
+                    'some/ios 2 1',
+                    'some/other/dir 2 1',
                 ]),
         MockFile(
             os.path.normpath('some/ios/file.mm'),
@@ -186,8 +186,8 @@ class InclusiveLanguageCheckTest(unittest.TestCase):
         MockFile(
             os.path.normpath(
                 'infra/inclusive_language_presubmit_exempt_dirs.txt'), [
-                    os.path.normpath('some/dir') + ' 2 1',
-                    os.path.normpath('some/other/dir') + ' 2 1',
+                    'some/dir 2 1',
+                    'some/other/dir 2 1',
                 ]),
         MockFile(
             os.path.normpath('some/ios/file.mm'),
@@ -249,8 +249,8 @@ class InclusiveLanguageCheckTest(unittest.TestCase):
         MockFile(
             os.path.normpath(
                 'infra/inclusive_language_presubmit_exempt_dirs.txt'), [
-                    os.path.normpath('.') + ' 2 1',
-                    os.path.normpath('some/other/dir') + ' 2 1',
+                    '. 2 1',
+                    'some/other/dir 2 1',
                 ]),
         MockFile(
             os.path.normpath('presubmit_canned_checks_test.py'),