diff --git a/csharp/ql/lib/semmle/code/csharp/Type.qll b/csharp/ql/lib/semmle/code/csharp/Type.qll
index 784ae5c69782..640b905b0740 100644
--- a/csharp/ql/lib/semmle/code/csharp/Type.qll
+++ b/csharp/ql/lib/semmle/code/csharp/Type.qll
@@ -736,8 +736,6 @@ class RefStruct extends Struct {
 
   override string getAPrimaryQlClass() { result = "RefStruct" }
 
-  override predicate isValueType() { none() }
-
   override predicate isRefLikeType() { any() }
 }