diff --git a/ICSharpCode.NRefactory.CSharp/Resolver/FindReferences.cs b/ICSharpCode.NRefactory.CSharp/Resolver/FindReferences.cs
index bd4d40a1c1..fa66d50a7d 100644
--- a/ICSharpCode.NRefactory.CSharp/Resolver/FindReferences.cs
+++ b/ICSharpCode.NRefactory.CSharp/Resolver/FindReferences.cs
@@ -381,8 +381,6 @@ namespace ICSharpCode.NRefactory.CSharp.Resolver
 		{
 			if (searchScopes == null)
 				throw new ArgumentNullException("searchScopes");
-			if (unresolvedFile == null)
-				throw new ArgumentNullException("unresolvedFile");
 			if (syntaxTree == null)
 				throw new ArgumentNullException("syntaxTree");
 			if (compilation == null)