diff --git a/libnymea-modbus/tools/connectiontool/modbustcp.py b/libnymea-modbus/tools/connectiontool/modbustcp.py
index c3eef89..dc2246f 100644
--- a/libnymea-modbus/tools/connectiontool/modbustcp.py
+++ b/libnymea-modbus/tools/connectiontool/modbustcp.py
@@ -79,7 +79,7 @@ def writePropertyGetSetMethodImplementationsTcp(fileDescriptor, className, regis
 
 def writePropertyUpdateMethodImplementationsTcp(fileDescriptor, className, registerDefinitions):
     for registerDefinition in registerDefinitions:
-        if 'readSchedule' not in registerDefinition or registerDefinition['readSchedule'] == 'init':
+        if 'readSchedule' in registerDefinition and registerDefinition['readSchedule'] == 'init':
             continue
 
         propertyName = registerDefinition['id']
diff --git a/libnymea-modbus/tools/connectiontool/toolcommon.py b/libnymea-modbus/tools/connectiontool/toolcommon.py
index 04f2d41..6db7f65 100644
--- a/libnymea-modbus/tools/connectiontool/toolcommon.py
+++ b/libnymea-modbus/tools/connectiontool/toolcommon.py
@@ -352,7 +352,7 @@ def writeBlockGetMethodDeclarations(fileDescriptor, registerDefinitions):
 
 def writePropertyUpdateMethodDeclarations(fileDescriptor, registerDefinitions):
     for registerDefinition in registerDefinitions:
-        if 'readSchedule' not in registerDefinition or registerDefinition['readSchedule'] == 'init':
+        if 'readSchedule' in registerDefinition and registerDefinition['readSchedule'] == 'init':
             continue
 
         propertyName = registerDefinition['id']