diff --git a/borgmatic/hooks/monitoring/ntfy.py b/borgmatic/hooks/monitoring/ntfy.py
index 0429e703..50b31744 100644
--- a/borgmatic/hooks/monitoring/ntfy.py
+++ b/borgmatic/hooks/monitoring/ntfy.py
@@ -22,6 +22,12 @@ def initialize_monitor(
     '''
 
 
+def _convert_string_to_array(value):
+    value = str(value or '')
+
+    return [str(item).strip() for item in value.split(',') if str(item).strip()]
+
+
 PRIORITY_NAME_TO_ID = {
     'max': 5,
     'urgent': 5,
@@ -66,7 +72,7 @@ def ping_monitor(hook_config, config, config_filename, state, monitoring_log_lev
             'title': state_config.get('title'),
             'message': state_config.get('message'),
             'priority': PRIORITY_NAME_TO_ID.get(state_config.get('priority'), default_priority),
-            'tags': state_config.get('tags'),
+            'tags': _convert_string_to_array(state_config.get('tags')),
         }
 
         try:
diff --git a/tests/unit/hooks/monitoring/test_ntfy.py b/tests/unit/hooks/monitoring/test_ntfy.py
index 7588edd6..6280785a 100644
--- a/tests/unit/hooks/monitoring/test_ntfy.py
+++ b/tests/unit/hooks/monitoring/test_ntfy.py
@@ -25,7 +25,7 @@ CUSTOM_MESSAGE_PAYLOAD = {
     'title': CUSTOM_MESSAGE_CONFIG['title'],
     'message': CUSTOM_MESSAGE_CONFIG['message'],
     'priority': 1,
-    'tags': CUSTOM_MESSAGE_CONFIG['tags'],
+    'tags': [CUSTOM_MESSAGE_CONFIG['tags']],
 }
 
 
@@ -35,7 +35,7 @@ def default_message_payload(state=Enum):
         'title': f'A borgmatic {state.name} event happened',
         'message': f'A borgmatic {state.name} event happened',
         'priority': 3,
-        'tags': 'borgmatic',
+        'tags': ['borgmatic'],
     }