diff --git a/NEWS b/NEWS
index e5be7599..9bf6a387 100644
--- a/NEWS
+++ b/NEWS
@@ -5,6 +5,7 @@
  * #794: Fix a traceback when the "repositories" option contains both strings and key/value pairs.
  * #800: Add configured repository labels to the JSON output for all actions.
  * #802: The "check --force" flag now runs checks even if "check" is in "skip_actions".
+ * #804: Validate the configured action names in the "skip_actions" option.
  * When logging commands that borgmatic executes, log the environment variables that
    borgmatic sets for those commands. (But don't log their values, since they often contain
    passwords.)
diff --git a/borgmatic/config/schema.yaml b/borgmatic/config/schema.yaml
index 04f8c0c6..e66ba624 100644
--- a/borgmatic/config/schema.yaml
+++ b/borgmatic/config/schema.yaml
@@ -535,6 +535,26 @@ properties:
         type: array
         items:
             type: string
+            enum:
+                - rcreate
+                - transfer
+                - prune
+                - compact
+                - create
+                - check
+                - extract
+                - config
+                - export-tar
+                - mount
+                - umount
+                - restore
+                - rlist
+                - list
+                - rinfo
+                - info
+                - break-lock
+                - key
+                - borg
         description: |
             List of one or more actions to skip running for this configuration
             file, even if specified on the command-line (explicitly or
diff --git a/tests/integration/config/test_schema.py b/tests/integration/config/test_schema.py
index 7300779f..1b57e461 100644
--- a/tests/integration/config/test_schema.py
+++ b/tests/integration/config/test_schema.py
@@ -1,3 +1,9 @@
+import pkgutil
+
+import borgmatic.actions
+import borgmatic.config.load
+import borgmatic.config.validate
+
 MAXIMUM_LINE_LENGTH = 80
 
 
@@ -6,3 +12,23 @@ def test_schema_line_length_stays_under_limit():
 
     for line in schema_file.readlines():
         assert len(line.rstrip('\n')) <= MAXIMUM_LINE_LENGTH
+
+
+ACTIONS_MODULE_NAMES_TO_OMIT = {'arguments', 'export_key', 'json'}
+ACTIONS_MODULE_NAMES_TO_ADD = {'key', 'umount'}
+
+
+def test_schema_skip_actions_correspond_to_supported_actions():
+    '''
+    Ensure that the allowed actions in the schema's "skip_actions" option don't drift from
+    borgmatic's actual supported actions.
+    '''
+    schema = borgmatic.config.load.load_configuration(borgmatic.config.validate.schema_filename())
+    schema_skip_actions = set(schema['properties']['skip_actions']['items']['enum'])
+    supported_actions = {
+        module.name.replace('_', '-')
+        for module in pkgutil.iter_modules(borgmatic.actions.__path__)
+        if module.name not in ACTIONS_MODULE_NAMES_TO_OMIT
+    }.union(ACTIONS_MODULE_NAMES_TO_ADD)
+
+    assert schema_skip_actions == supported_actions