diff --git a/Source/Indicators/MACD_Series.cs b/Source/Indicators/MACD_Series.cs
index 0e75a26e..b8172d46 100644
--- a/Source/Indicators/MACD_Series.cs
+++ b/Source/Indicators/MACD_Series.cs
@@ -16,9 +16,9 @@ Sources:
 
 public class MACD_Series : Single_TSeries_Indicator
 {
-    private EMA_Series _TSslow;
-    private EMA_Series _TSfast;
-    private SUB_Series _TSmacd;
+    private readonly EMA_Series _TSslow;
+    private readonly EMA_Series _TSfast;
+    private readonly SUB_Series _TSmacd;
     public EMA_Series Signal { get; }
 
     public MACD_Series(TSeries source, int slow = 26, int fast = 12, int signal = 9, bool useNaN = false)
@@ -27,7 +27,7 @@ public class MACD_Series : Single_TSeries_Indicator
         _TSslow = new(source: source, period: slow, useNaN: false);
         _TSfast = new(source: source, period: fast, useNaN: false);
         _TSmacd = new(_TSfast, _TSslow);
-        Signal = new(source: _TSmacd, period: signal, useNaN: useNaN);
+        this.Signal = new(source: _TSmacd, period: signal, useNaN: useNaN);
 
         if (source.Count > 0) { base.Add(_TSmacd); }
     }
diff --git a/Source/Indicators/RSI_Series.cs b/Source/Indicators/RSI_Series.cs
index e9d57f39..5cec4d88 100644
--- a/Source/Indicators/RSI_Series.cs
+++ b/Source/Indicators/RSI_Series.cs
@@ -16,10 +16,10 @@ public class RSI_Series : Single_TSeries_Indicator
 {
     private readonly System.Collections.Generic.List<double> _gain = new();
     private readonly System.Collections.Generic.List<double> _loss = new();
-    double _avgGain = 0;
-    double _avgLoss = 0;
-    double _lastValue = 0;
-    double _lastlastValue = 0;
+    private double _avgGain;
+    private double _avgLoss;
+    private double _lastValue;
+    private double _lastlastValue;
 
     public RSI_Series(TSeries source, int period = 10, bool useNaN = false) : base(source, period: period, useNaN: useNaN)
     { if (source.Count > 0) { base.Add(source); } }