diff --git a/components/script/dom/webglrenderingcontext.rs b/components/script/dom/webglrenderingcontext.rs
index 529b9285f2d..c4c580cda32 100644
--- a/components/script/dom/webglrenderingcontext.rs
+++ b/components/script/dom/webglrenderingcontext.rs
@@ -1118,10 +1118,10 @@ pub fn capture_webgl_backtrace<T: DomObject>(_: &T) -> WebGLCommandBacktrace {
 pub fn capture_webgl_backtrace<T: DomObject>(obj: &T) -> WebGLCommandBacktrace {
     let bt = Backtrace::new();
     unsafe {
-        capture_stack!(in(obj.global().get_cx()) let stack);
+        capture_stack!(in(*obj.global().get_cx()) let stack);
         WebGLCommandBacktrace {
             backtrace: format!("{:?}", bt),
-            js_backtrace: stack.and_then(|s| s.as_string(None)),
+            js_backtrace: stack.and_then(|s| s.as_string(None, js::jsapi::StackFormat::Default)),
         }
     }
 }