diff --git a/owrx/config.py b/owrx/config.py
index 4aa1c8e..bdecd04 100644
--- a/owrx/config.py
+++ b/owrx/config.py
@@ -26,6 +26,11 @@ class ConfigMigrator(ABC):
     def migrate(self, config):
         pass
 
+    def renameKey(self, config, old, new):
+        if old in config and not new in config:
+            config[new] = config[old]
+            del config[old]
+
 
 class ConfigMigratorVersion1(ConfigMigrator):
     def migrate(self, config):
@@ -37,6 +42,9 @@ class ConfigMigratorVersion1(ConfigMigrator):
             levels = config["waterfall_auto_level_margin"]
             config["waterfall_auto_level_margin"] = {"min": levels[0], "max": levels[1]}
 
+        self.renameKey(config, "wsjt_queue_workers", "decoding_queue_workers")
+        self.renameKey(config, "wsjt_queue_length", "decoding_queue_length")
+
         config["version"] = 2
         return config
 
diff --git a/owrx/property/__init__.py b/owrx/property/__init__.py
index 853cca3..f3560fa 100644
--- a/owrx/property/__init__.py
+++ b/owrx/property/__init__.py
@@ -40,6 +40,10 @@ class PropertyManager(ABC):
     def __dict__(self):
         pass
 
+    @abstractmethod
+    def __delitem__(self, key):
+        pass
+
     @abstractmethod
     def keys(self):
         pass
@@ -98,6 +102,9 @@ class PropertyLayer(PropertyManager):
     def __dict__(self):
         return {k: v for k, v in self.properties.items()}
 
+    def __delitem__(self, key):
+        return self.properties.__delitem__(key)
+
     def keys(self):
         return self.properties.keys()
 
@@ -132,6 +139,11 @@ class PropertyFilter(PropertyManager):
     def __dict__(self):
         return {k: v for k, v in self.pm.__dict__().items() if k in self.props}
 
+    def __delitem__(self, key):
+        if key not in self.props:
+            raise KeyError(key)
+        return self.pm.__delitem__(key)
+
     def keys(self):
         return [k for k in self.pm.keys() if k in self.props]
 
@@ -226,5 +238,9 @@ class PropertyStack(PropertyManager):
     def __dict__(self):
         return {k: self.__getitem__(k) for k in self.keys()}
 
+    def __delitem__(self, key):
+        for layer in self.layers:
+            layer["props"].__delitem__(key)
+
     def keys(self):
         return set([key for l in self.layers for key in l["props"].keys()])