diff --git a/pymodbus/exceptions.py b/pymodbus/exceptions.py
index c143569f5..17d659383 100644
--- a/pymodbus/exceptions.py
+++ b/pymodbus/exceptions.py
@@ -83,14 +83,13 @@ class InvalidResponseRecievedException(ModbusException):
     Error resulting from invalid response received or decoded
     """
 
+    def __init__(self, string=""):
+        ''' Initialize the exception
 
-def __init__(self, string=""):
-    ''' Initialize the exception
-
-    :param string: The message to append to the error
-    '''
-    message = "[Invalid Response] %s" % string
-    ModbusException.__init__(self, message)
+        :param string: The message to append to the error
+        '''
+        message = "[Invalid Response] %s" % string
+        ModbusException.__init__(self, message)
 
 #---------------------------------------------------------------------------#
 # Exported symbols