diff --git a/Framework/ArgsUniform/Assigner.cs b/Framework/ArgsUniform/Assigner.cs
index 9083b0e..4db7a08 100644
--- a/Framework/ArgsUniform/Assigner.cs
+++ b/Framework/ArgsUniform/Assigner.cs
@@ -1,4 +1,5 @@
 using System.Globalization;
+using System.Numerics;
 using System.Reflection;
 
 namespace ArgsUniform
@@ -105,6 +106,7 @@ namespace ArgsUniform
                     if (uniformProperty.PropertyType.IsEnum) return AssignEnum(result, uniformProperty, value);
                     if (uniformProperty.PropertyType == typeof(bool)) return AssignBool(result, uniformProperty, value);
                     if (uniformProperty.PropertyType == typeof(ulong)) return AssignUlong(result, uniformProperty, value);
+                    if (uniformProperty.PropertyType == typeof(BigInteger)) return AssignBigInt(result, uniformProperty, value);
 
                     throw new NotSupportedException(
                         $"Unsupported property type '${uniformProperty.PropertyType}' " +
@@ -144,6 +146,16 @@ namespace ArgsUniform
             return false;
         }
 
+        private bool AssignBigInt(T result, PropertyInfo uniformProperty, object value)
+        {
+            if (BigInteger.TryParse(value.ToString(), CultureInfo.InvariantCulture, out BigInteger i))
+            {
+                uniformProperty.SetValue(result, i);
+                return true;
+            }
+            return false;
+        }
+
         private static bool AssignBool(T result, PropertyInfo uniformProperty, object value)
         {
             var s = value.ToString();
diff --git a/ProjectPlugins/CodexContractsPlugin/TestTokenExtensions.cs b/ProjectPlugins/CodexContractsPlugin/TestTokenExtensions.cs
index a19abde..eccc849 100644
--- a/ProjectPlugins/CodexContractsPlugin/TestTokenExtensions.cs
+++ b/ProjectPlugins/CodexContractsPlugin/TestTokenExtensions.cs
@@ -1,4 +1,6 @@
-namespace CodexContractsPlugin
+using System.Numerics;
+
+namespace CodexContractsPlugin
 {
     public class TestToken : IComparable<TestToken>
     {
@@ -41,5 +43,10 @@
         {
             return new TestToken(i);
         }
+
+        public static TestToken TestTokens(this BigInteger i)
+        {
+            return new TestToken((decimal)i);
+        }
     }
 }
diff --git a/Tools/BiblioTech/Commands/MintCommand.cs b/Tools/BiblioTech/Commands/MintCommand.cs
index a017ee2..d6d616f 100644
--- a/Tools/BiblioTech/Commands/MintCommand.cs
+++ b/Tools/BiblioTech/Commands/MintCommand.cs
@@ -77,7 +77,7 @@ namespace BiblioTech.Commands
         private bool ShouldMintTestTokens(ICodexContracts contracts, EthAddress addr)
         {
             var testTokens = contracts.GetTestTokenBalance(addr);
-            return testTokens.Amount < Program.Config.MintTT;
+            return testTokens.Amount < Program.Config.MintTT.TestTokens().Amount;
         }
 
         private bool ShouldSendEth(IGethNode gethNode, EthAddress addr)
diff --git a/Tools/BiblioTech/Configuration.cs b/Tools/BiblioTech/Configuration.cs
index 9164cf7..b67689f 100644
--- a/Tools/BiblioTech/Configuration.cs
+++ b/Tools/BiblioTech/Configuration.cs
@@ -1,4 +1,5 @@
 using ArgsUniform;
+using System.Numerics;
 
 namespace BiblioTech
 {
@@ -32,7 +33,7 @@ namespace BiblioTech
         public int SendEth { get; set; } = 10;
 
         [Uniform("mint-tt", "mt", "MINTTT", true, "Amount of TestTokens minted by the mint command.")]
-        public int MintTT { get; set; } = 1073741824;
+        public BigInteger MintTT { get; set; } = 1073741824;
 
         public string EndpointsPath
         {