diff --git a/owrx/property/__init__.py b/owrx/property/__init__.py
index f04b115..88d80f4 100644
--- a/owrx/property/__init__.py
+++ b/owrx/property/__init__.py
@@ -264,6 +264,9 @@ class PropertyReadOnly(PropertyDelegator):
     def __setitem__(self, key, value):
         raise PropertyWriteError(key)
 
+    def __delitem__(self, key):
+        raise PropertyWriteError(key)
+
 
 class PropertyStack(PropertyManager):
     def __init__(self):
diff --git a/test/property/test_property_readonly.py b/test/property/test_property_readonly.py
index a6e74f7..09d57ee 100644
--- a/test/property/test_property_readonly.py
+++ b/test/property/test_property_readonly.py
@@ -13,3 +13,11 @@ class PropertyReadOnlyTest(TestCase):
             ro["otherkey"] = "testvalue"
         self.assertEqual(ro["testkey"], "initial value")
         self.assertNotIn("otherkey", ro)
+
+    def testPreventsDeletes(self):
+        layer = PropertyLayer(testkey="some value")
+        ro = PropertyReadOnly(layer)
+        with self.assertRaises(PropertyWriteError):
+            del ro["testkey"]
+        self.assertEqual(ro["testkey"], "some value")
+        self.assertEqual(layer["testkey"], "some value")