diff --git a/talipp/indicators/SFX.py b/talipp/indicators/SFX.py
index 131628b..e30b84d 100644
--- a/talipp/indicators/SFX.py
+++ b/talipp/indicators/SFX.py
@@ -57,10 +57,11 @@ def __init__(self, atr_period: int,
 
         self.atr = ATR(atr_period)
         self.std_dev = StdDev(std_dev_period, input_modifier=ValueExtractor.extract_close)
-        self.ma_std_dev = MAFactory.get_ma(ma_type, std_dev_smoothing_period, input_indicator=self.std_dev)
+        self.ma_std_dev = MAFactory.get_ma(ma_type, std_dev_smoothing_period)
 
         self.add_sub_indicator(self.atr)
         self.add_sub_indicator(self.std_dev)
+        self.add_managed_sequence(self.ma_std_dev)
 
         self.initialize(input_values, input_indicator)