diff --git a/Source/DafnyCore/AST/Attributes.cs b/Source/DafnyCore/AST/Attributes.cs
index a48569b880..69d5cfe7d8 100644
--- a/Source/DafnyCore/AST/Attributes.cs
+++ b/Source/DafnyCore/AST/Attributes.cs
@@ -367,9 +367,9 @@ public static Attributes ExpandAtAttribute(Program program, UserSuppliedAtAttrib
       .WithArg("low", Type.Int, DefaultInt(1))
       .WithArg("high", Type.Int, DefaultInt(2))
       .WithArg("functionName", Type.ResolvedString(), DefaultString(""))
-      .Filter(attributeHost => attributeHost is Function),
+      .Filter(attributeHost => attributeHost is Function or AssertStmt),
     BuiltIn("IsolateAssertions")
-      .Filter(attributeHost => attributeHost is MemberDecl or DatatypeDecl or RedirectingTypeDecl),
+      .Filter(attributeHost => attributeHost is ICanVerify),
     BuiltIn("Options")
       .WithArg(TupleItem0Name, Type.ResolvedString())
       .Filter(attributeHost => attributeHost is ModuleDecl or ModuleDefinition),