diff --git a/killswitch.py b/killswitch.py
index 3a17f022..346d4099 100644
--- a/killswitch.py
+++ b/killswitch.py
@@ -81,8 +81,9 @@ def _apply(target: UPDATABLE_DATA, key: str, to_set: Any = None, delete: bool =
         if idx is None:
             raise ValueError(f'Cannot use string {key!r} as int for index into Sequence')
 
-        if delete:
-            if len(target) > idx:
+        if delete and len(target) > 0:
+            length = len(target)
+            if (idx > 0 and length > idx) or idx >= -length:
                 target.pop(idx)
 
         elif len(target) == idx:
diff --git a/tests/killswitch.py/test_apply.py b/tests/killswitch.py/test_apply.py
index 0e10849d..29517203 100644
--- a/tests/killswitch.py/test_apply.py
+++ b/tests/killswitch.py/test_apply.py
@@ -15,7 +15,10 @@ from killswitch import UPDATABLE_DATA
         (['this', 'is', 'a', 'test'], '1', '', None, ['this', None, 'a', 'test']),
         ({'now': 'with', 'a': 'dict'}, 'now', 'delete', None, {'a': 'dict'}),
         ({'now': 'with', 'a': 'dict'}, 'now', '', None, {'now': None, 'a': 'dict'}),
-        (['test append'], '1', '', 'yay', ['test append', 'yay'])
+        (['test append'], '1', '', 'yay', ['test append', 'yay']),
+        (['test neg del'], '-1', 'delete', None, []),
+        (['test neg del'], '-1337', 'delete', None, ['test neg del']),
+        (['test neg del'], '-2', 'delete', None, ['test neg del']),
     ]
 )
 def test_apply(source: UPDATABLE_DATA, key: str, action: str, to_set: Any, result: UPDATABLE_DATA) -> None: