diff --git a/js/src/devtools/rootAnalysis/annotations.js b/js/src/devtools/rootAnalysis/annotations.js
index 08267463757..530e489bdf3 100644
--- a/js/src/devtools/rootAnalysis/annotations.js
+++ b/js/src/devtools/rootAnalysis/annotations.js
@@ -165,6 +165,13 @@ var ignoreFunctions = {
     "void js::AutoCompartment::~AutoCompartment(int32)" : true,
     "void JSAutoCompartment::~JSAutoCompartment(int32)" : true,
 
+    // Bug 948646 - the only thing AutoJSContext's constructor calls
+    // is an Init() routine whose entire body is covered with an
+    // AutoAssertNoGC. AutoSafeJSContext is the same thing, just with
+    // a different value for the 'aSafe' parameter.
+    "void mozilla::AutoJSContext::AutoJSContext(mozilla::detail::GuardObjectNotifier*)" : true,
+    "void mozilla::AutoSafeJSContext::~AutoSafeJSContext(int32)" : true,
+
     // And these are workarounds to avoid even more analysis work,
     // which would sadly still be needed even with bug 898815.
     "void js::AutoCompartment::AutoCompartment(js::ExclusiveContext*, JSCompartment*)": true,