diff --git a/widget/windows/winrt/MetroApp.cpp b/widget/windows/winrt/MetroApp.cpp
index d048fd6f77f..b22e2cfbe4a 100644
--- a/widget/windows/winrt/MetroApp.cpp
+++ b/widget/windows/winrt/MetroApp.cpp
@@ -222,6 +222,10 @@ XRE_MetroCoreApplicationRun()
   }
 #endif
 
+  // Experimental work around for random timing/MozAfterPaint problems
+  // in mochiperf tests. (Bug 886109)
+  PR_Now();
+
   sMetroApp = Make<MetroApp>();
 
   HStringReference className(RuntimeClass_Windows_ApplicationModel_Core_CoreApplication);