diff --git a/CryptoExchange.Net.UnitTests/SymbolOrderBookTests.cs b/CryptoExchange.Net.UnitTests/SymbolOrderBookTests.cs
index f466e41..17ffd66 100644
--- a/CryptoExchange.Net.UnitTests/SymbolOrderBookTests.cs
+++ b/CryptoExchange.Net.UnitTests/SymbolOrderBookTests.cs
@@ -19,7 +19,7 @@ namespace CryptoExchange.Net.UnitTests
 
         private class TestableSymbolOrderBook : SymbolOrderBook
         {
-            public TestableSymbolOrderBook() : base(null, "Test", "BTC/USD")
+            public TestableSymbolOrderBook() : base(null, "Test", "Test", "BTC/USD")
             {
                 Initialize(_defaultOrderBookOptions);
             }