diff --git a/Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator/IDLParser.cpp b/Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator/IDLParser.cpp
index d894cff12c..4002337ab5 100644
--- a/Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator/IDLParser.cpp
+++ b/Meta/Lagom/Tools/CodeGenerators/LibWeb/WrapperGenerator/IDLParser.cpp
@@ -910,6 +910,9 @@ Interface& Parser::parse()
                 interface.stringifier_attribute = mixin->stringifier_attribute;
                 interface.has_stringifier = true;
             }
+
+            if (mixin->has_unscopable_member)
+                interface.has_unscopable_member = true;
         }
     }