diff --git a/crates/webidl/src/lib.rs b/crates/webidl/src/lib.rs
index 57387b2de93..12469d150dd 100644
--- a/crates/webidl/src/lib.rs
+++ b/crates/webidl/src/lib.rs
@@ -222,6 +222,7 @@ impl<'a> WebidlParse<&'a webidl::ast::NonPartialInterface> for webidl::ast::Exte
                     .map(|arg| (&*arg.name, &*arg.type_, arg.variadic)),
                 Some(self_ty),
                 kind,
+                false,
             ).map(|function| {
                 program.imports.push(backend::ast::Import {
                     module: None,
@@ -320,12 +321,14 @@ impl<'a> WebidlParse<&'a str> for webidl::ast::RegularAttribute {
             return Ok(());
         }
 
-        create_getter(&self.name, &self.type_, self_name, false)
+        let is_structural = util::is_structural(&self.extended_attributes);
+
+        create_getter(&self.name, &self.type_, self_name, false, is_structural)
             .map(wrap_import_function)
             .map(|import| program.imports.push(import));
 
         if !self.read_only {
-            create_setter(&self.name, &self.type_, self_name, false)
+            create_setter(&self.name, &self.type_, self_name, false, is_structural)
                 .map(wrap_import_function)
                 .map(|import| program.imports.push(import));
         }
@@ -340,12 +343,14 @@ impl<'a> WebidlParse<&'a str> for webidl::ast::StaticAttribute {
             return Ok(());
         }
 
-        create_getter(&self.name, &self.type_, self_name, true)
+        let is_structural = util::is_structural(&self.extended_attributes);
+
+        create_getter(&self.name, &self.type_, self_name, true, is_structural)
             .map(wrap_import_function)
             .map(|import| program.imports.push(import));
 
         if !self.read_only {
-            create_setter(&self.name, &self.type_, self_name, true)
+            create_setter(&self.name, &self.type_, self_name, true, is_structural)
                 .map(wrap_import_function)
                 .map(|import| program.imports.push(import));
         }
diff --git a/crates/webidl/src/util.rs b/crates/webidl/src/util.rs
index b79445dbb23..480aba66cd6 100644
--- a/crates/webidl/src/util.rs
+++ b/crates/webidl/src/util.rs
@@ -151,6 +151,7 @@ pub fn create_function<'a, I>(
     arguments: I,
     ret: Option<syn::Type>,
     kind: backend::ast::ImportFunctionKind,
+    structural: bool,
 ) -> Option<backend::ast::ImportFunction>
 where
     I: Iterator<Item = (&'a str, &'a webidl::ast::Type, bool)>,
@@ -184,7 +185,7 @@ where
         rust_name,
         js_ret,
         catch: false,
-        structural: false,
+        structural,
         kind,
         shim,
     })
@@ -233,6 +234,7 @@ pub fn create_basic_method(
             .map(|arg| (&*arg.name, &*arg.type_, arg.variadic)),
         ret,
         kind,
+        false,
     )
 }
 
@@ -241,6 +243,7 @@ pub fn create_getter(
     ty: &webidl::ast::Type,
     self_name: &str,
     is_static: bool,
+    is_structural: bool,
 ) -> Option<backend::ast::ImportFunction> {
     let ret = match webidl_ty_to_syn_ty(ty, TypePosition::Return) {
         None => {
@@ -259,7 +262,7 @@ pub fn create_getter(
         }),
     };
 
-    create_function(name, iter::empty(), ret, kind)
+    create_function(name, iter::empty(), ret, kind, is_structural)
 }
 
 pub fn create_setter(
@@ -267,6 +270,7 @@ pub fn create_setter(
     ty: &webidl::ast::Type,
     self_name: &str,
     is_static: bool,
+    is_structural: bool,
 ) -> Option<backend::ast::ImportFunction> {
     let kind = backend::ast::ImportFunctionKind::Method {
         class: self_name.to_string(),
@@ -282,6 +286,7 @@ pub fn create_setter(
         iter::once((name, ty, false)),
         None,
         kind,
+        is_structural,
     )
 }
 
@@ -289,29 +294,24 @@ pub fn create_setter(
 pub fn is_chrome_only(ext_attrs: &[Box<ExtendedAttribute>]) -> bool {
     ext_attrs.iter().any(|external_attribute| {
         return match &**external_attribute {
-            ExtendedAttribute::ArgumentList(al) => {
-                println!("ArgumentList");
-                al.name == "ChromeOnly"
-            }
-            ExtendedAttribute::Identifier(i) => {
-                println!("Identifier");
-                i.lhs == "ChromeOnly"
-            }
-            ExtendedAttribute::IdentifierList(il) => {
-                println!("IdentifierList");
-                il.lhs == "ChromeOnly"
-            }
-            ExtendedAttribute::NamedArgumentList(nal) => {
-                println!("NamedArgumentList");
-                nal.lhs_name == "ChromeOnly"
-            }
+            ExtendedAttribute::ArgumentList(al) => al.name == "ChromeOnly",
+            ExtendedAttribute::Identifier(i) => i.lhs == "ChromeOnly",
+            ExtendedAttribute::IdentifierList(il) => il.lhs == "ChromeOnly",
+            ExtendedAttribute::NamedArgumentList(nal) => nal.lhs_name == "ChromeOnly",
             ExtendedAttribute::NoArguments(webidl::ast::Other::Identifier(name)) => {
                 name == "ChromeOnly"
             }
-            ExtendedAttribute::NoArguments(_na) => {
-                println!("NoArguments");
-                false
-            }
+            ExtendedAttribute::NoArguments(_na) => false,
         };
     })
 }
+
+pub fn is_structural(attrs: &[Box<ExtendedAttribute>]) -> bool {
+    attrs.iter().any(|attr| {
+        if let ExtendedAttribute::NoArguments(webidl::ast::Other::Identifier(ref name)) = **attr {
+            name == "Unforgeable"
+        } else {
+            false
+        }
+    })
+}
diff --git a/tests/all/webidl/simple.rs b/tests/all/webidl/simple.rs
index f833b70b0f7..7263753361e 100644
--- a/tests/all/webidl/simple.rs
+++ b/tests/all/webidl/simple.rs
@@ -324,3 +324,49 @@ fn one_method_using_an_undefined_import_doesnt_break_all_other_methods() {
         )
         .test();
 }
+
+#[test]
+fn unforgeable_is_structural() {
+    project()
+        .file(
+            "foo.webidl",
+            r#"
+                [Constructor()]
+                interface Foo {
+                    [Unforgeable] readonly attribute short uno;
+                                  readonly attribute short dos;
+                };
+            "#,
+        )
+        .file(
+            "foo.js",
+            r#"
+                export class Foo {
+                    constructor() {
+                        this.uno = 1;
+                    }
+                    get dos() {
+                        return 2;
+                    }
+                }
+            "#,
+        )
+        .file(
+            "src/lib.rs",
+            r#"
+                #![feature(proc_macro, wasm_custom_section, wasm_import_module)]
+                extern crate wasm_bindgen;
+                use wasm_bindgen::prelude::*;
+
+                pub mod foo;
+
+                #[wasm_bindgen]
+                pub fn test() {
+                    let f = foo::Foo::new();
+                    assert_eq!(f.uno(), 1);
+                    assert_eq!(f.dos(), 2);
+                }
+            "#,
+        )
+        .test();
+}