diff --git a/borgmatic/borg/environment.py b/borgmatic/borg/environment.py
index 0bee5711..ac7ffcfd 100644
--- a/borgmatic/borg/environment.py
+++ b/borgmatic/borg/environment.py
@@ -17,6 +17,7 @@ OPTION_TO_ENVIRONMENT_VARIABLE = {
 DEFAULT_BOOL_OPTION_TO_DOWNCASE_ENVIRONMENT_VARIABLE = {
     'relocated_repo_access_is_ok': 'BORG_RELOCATED_REPO_ACCESS_IS_OK',
     'unknown_unencrypted_repo_access_is_ok': 'BORG_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK',
+    'use_chunks_archive': 'BORG_USE_CHUNKS_ARCHIVE',
 }
 
 DEFAULT_BOOL_OPTION_TO_UPPERCASE_ENVIRONMENT_VARIABLE = {
@@ -79,9 +80,6 @@ def make_environment(config):
         os.set_inheritable(read_file_descriptor, True)
         environment['BORG_PASSPHRASE_FD'] = str(read_file_descriptor)
 
-    if 'use_chunks_archive' in config:
-        environment['BORG_USE_CHUNKS_ARCHIVE'] = 'yes' if config.get('use_chunks_archive') else 'no'
-
     for (
         option_name,
         environment_variable_name,
diff --git a/borgmatic/config/schema.yaml b/borgmatic/config/schema.yaml
index f20490ca..494b0d70 100644
--- a/borgmatic/config/schema.yaml
+++ b/borgmatic/config/schema.yaml
@@ -395,7 +395,7 @@ properties:
             Enables or disables the use of chunks.archive.d for faster cache
             resyncs in Borg. If true, value is set to "yes" (default) else
             it's set to "no", reducing disk usage but slowing resyncs.
-        default: true
+        example: true
     borg_files_cache_ttl:
         type: integer
         description: |
diff --git a/tests/unit/borg/test_environment.py b/tests/unit/borg/test_environment.py
index 093a0c6d..4631f62f 100644
--- a/tests/unit/borg/test_environment.py
+++ b/tests/unit/borg/test_environment.py
@@ -92,6 +92,7 @@ def test_make_environment_without_configuration_sets_certain_environment_variabl
         'BORG_EXIT_CODES': 'modern',
         'BORG_RELOCATED_REPO_ACCESS_IS_OK': 'no',
         'BORG_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK': 'no',
+        'BORG_USE_CHUNKS_ARCHIVE': 'no',
     }
 
 
@@ -101,6 +102,7 @@ def test_make_environment_without_configuration_passes_through_default_environme
             'USER': 'root',
             'BORG_RELOCATED_REPO_ACCESS_IS_OK': 'yup',
             'BORG_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK': 'nah',
+            'BORG_USE_CHUNKS_ARCHIVE': 'yup',
         }
     )
     flexmock(module.borgmatic.hooks.credential.parse).should_receive(
@@ -113,6 +115,7 @@ def test_make_environment_without_configuration_passes_through_default_environme
         'USER': 'root',
         'BORG_RELOCATED_REPO_ACCESS_IS_OK': 'yup',
         'BORG_UNKNOWN_UNENCRYPTED_REPO_ACCESS_IS_OK': 'nah',
+        'BORG_USE_CHUNKS_ARCHIVE': 'yup',
         'BORG_EXIT_CODES': 'modern',
     }