diff --git a/src/dotnet-library/scala/runtime/RichClass.scala b/src/dotnet-library/scala/runtime/RichClass.scala
index 23f3c9dfe..d8ce94941 100644
--- a/src/dotnet-library/scala/runtime/RichClass.scala
+++ b/src/dotnet-library/scala/runtime/RichClass.scala
@@ -21,5 +21,6 @@ final class RichClass(val self: Class[_]) extends Proxy {
   def getClass(): RichClass = this
   def getName(): String = self.Name
   def getComponentType(): Class[_] = self.GetElementType
+  def isAssignableFrom(other: RichClass) = self.IsAssignableFrom(other.self)
 
 }