diff --git a/ClosedXML/Excel/CalcEngine/Functions/Text.cs b/ClosedXML/Excel/CalcEngine/Functions/Text.cs
index b91728c..ad9e220 100644
--- a/ClosedXML/Excel/CalcEngine/Functions/Text.cs
+++ b/ClosedXML/Excel/CalcEngine/Functions/Text.cs
@@ -38,7 +38,7 @@
             ce.RegisterFunction("TRIM", 1, Trim); // Removes spaces from text
             ce.RegisterFunction("UPPER", 1, Upper); // Converts text to uppercase
             ce.RegisterFunction("VALUE", 1, Value); // Converts a text argument to a number
-            ce.RegisterFunction("HYPERLINK", 1, Hyperlink);
+            ce.RegisterFunction("HYPERLINK", 2, Hyperlink);
         }
 
         private static object _Char(List<Expression> p)