diff --git a/src/components/script/dom/performance.rs b/src/components/script/dom/performance.rs
index 86c431a948e..20dbfcf590a 100644
--- a/src/components/script/dom/performance.rs
+++ b/src/components/script/dom/performance.rs
@@ -6,7 +6,7 @@ use dom::bindings::codegen::Bindings::PerformanceBinding;
 use dom::bindings::global::Window;
 use dom::bindings::js::{JS, JSRef, Temporary};
 use dom::bindings::utils::{Reflectable, Reflector, reflect_dom_object};
-use dom::performancetiming::{PerformanceTiming, PerformanceTimingMethods};
+use dom::performancetiming::{PerformanceTiming, PerformanceTimingHelpers};
 use dom::window::Window;
 use time;
 
diff --git a/src/components/script/dom/performancetiming.rs b/src/components/script/dom/performancetiming.rs
index 646dd9b087b..b2cb4a0a6f8 100644
--- a/src/components/script/dom/performancetiming.rs
+++ b/src/components/script/dom/performancetiming.rs
@@ -35,14 +35,19 @@ impl PerformanceTiming {
 
 pub trait PerformanceTimingMethods {
     fn NavigationStart(&self) -> u64;
-    fn NavigationStartPrecise(&self) -> f64;
 }
 
 impl<'a> PerformanceTimingMethods for JSRef<'a, PerformanceTiming> {
     fn NavigationStart(&self) -> u64 {
         self.navigationStart
     }
+}
 
+pub trait PerformanceTimingHelpers {
+    fn NavigationStartPrecise(&self) -> f64;
+}
+
+impl<'a> PerformanceTimingHelpers for JSRef<'a, PerformanceTiming> {
     fn NavigationStartPrecise(&self) -> f64 {
         self.navigationStartPrecise
     }