diff --git a/components/script/dom/customelementregistry.rs b/components/script/dom/customelementregistry.rs
index 74df800bba5..b4ad9365f4f 100644
--- a/components/script/dom/customelementregistry.rs
+++ b/components/script/dom/customelementregistry.rs
@@ -343,7 +343,7 @@ impl CustomElementRegistryMethods for CustomElementRegistry {
         // Step 1
         if !is_valid_custom_element_name(&name) {
             let promise = Promise::new(global_scope);
-            promise.reject_native(global_scope.get_cx(), &DOMException::new(global_scope, DOMErrorName::SyntaxError));
+            promise.reject_native(&DOMException::new(global_scope, DOMErrorName::SyntaxError));
             return promise
         }
 
diff --git a/components/script/dom/promise.rs b/components/script/dom/promise.rs
index a0ad29753ba..9ba110456c8 100644
--- a/components/script/dom/promise.rs
+++ b/components/script/dom/promise.rs
@@ -162,7 +162,9 @@ impl Promise {
     }
 
     #[allow(unsafe_code)]
-    pub fn reject_native<T>(&self, cx: *mut JSContext, val: &T) where T: ToJSValConvertible {
+    pub fn reject_native<T>(&self, val: &T) where T: ToJSValConvertible {
+        let cx = self.global().get_cx();
+        let _ac = JSAutoCompartment::new(cx, self.reflector().get_jsobject().get());
         rooted!(in(cx) let mut v = UndefinedValue());
         unsafe {
             val.to_jsval(cx, v.handle_mut());
diff --git a/components/script/dom/vr.rs b/components/script/dom/vr.rs
index 651c85c8f6f..226979d0888 100644
--- a/components/script/dom/vr.rs
+++ b/components/script/dom/vr.rs
@@ -73,7 +73,7 @@ impl VRMethods for VR {
                     }
                 },
                 Err(e) => {
-                    promise.reject_native(promise.global().get_cx(), &e);
+                    promise.reject_native(&e);
                     return promise;
                 }
             }
diff --git a/components/script/dom/vrdisplay.rs b/components/script/dom/vrdisplay.rs
index de488f0c5e2..97e126db4ed 100644
--- a/components/script/dom/vrdisplay.rs
+++ b/components/script/dom/vrdisplay.rs
@@ -284,7 +284,7 @@ impl VRDisplayMethods for VRDisplay {
         // WebVR spec: If canPresent is false the promise MUST be rejected
         if !self.display.borrow().capabilities.can_present {
             let msg = "VRDisplay canPresent is false".to_string();
-            promise.reject_native(promise.global().get_cx(), &msg);
+            promise.reject_native(&msg);
             return promise;
         }
 
@@ -294,7 +294,7 @@ impl VRDisplayMethods for VRDisplay {
         // That functionality is not allowed by this revision of the spec.
         if layers.len() != 1 {
             let msg = "The number of layers must be 1".to_string();
-            promise.reject_native(promise.global().get_cx(), &msg);
+            promise.reject_native(&msg);
             return promise;
         }
 
@@ -311,7 +311,7 @@ impl VRDisplayMethods for VRDisplay {
             },
             Err(msg) => {
                 let msg = msg.to_string();
-                promise.reject_native(promise.global().get_cx(), &msg);
+                promise.reject_native(&msg);
                 return promise;
             }
         };
@@ -338,7 +338,7 @@ impl VRDisplayMethods for VRDisplay {
                 promise.resolve_native(&());
             },
             Err(e) => {
-                promise.reject_native(promise.global().get_cx(), &e);
+                promise.reject_native(&e);
             }
         }
 
@@ -353,7 +353,7 @@ impl VRDisplayMethods for VRDisplay {
         // WebVR spec: If the VRDisplay is not presenting the promise MUST be rejected.
         if !self.presenting.get() {
             let msg = "VRDisplay is not presenting".to_string();
-            promise.reject_native(promise.global().get_cx(), &msg);
+            promise.reject_native(&msg);
             return promise;
         }
 
@@ -369,7 +369,7 @@ impl VRDisplayMethods for VRDisplay {
                 promise.resolve_native(&());
             },
             Err(e) => {
-                promise.reject_native(promise.global().get_cx(), &e);
+                promise.reject_native(&e);
             }
         }