diff --git a/js/src/jsapi.cpp b/js/src/jsapi.cpp
index fc013c14cb..3ce22113ed 100644
--- a/js/src/jsapi.cpp
+++ b/js/src/jsapi.cpp
@@ -4771,6 +4771,20 @@ JS::GetScriptPrivate(JSScript* script)
     return script->scriptSourceUnwrap().canonicalPrivate();
 }
 
+JS_PUBLIC_API(JS::Value)
+JS::GetScriptedCallerPrivate(JSContext* cx)
+{
+  AssertHeapIsIdle(cx);
+  CHECK_REQUEST(cx);
+
+  NonBuiltinFrameIter iter(cx, cx->compartment()->principals());
+  if (iter.done() || !iter.hasScript()) {
+    return UndefinedValue();
+  }
+
+  return FindScriptOrModulePrivateForScript(iter.script());
+}
+
 JS_PUBLIC_API(JS::ScriptPrivateFinalizeHook)
 JS::GetScriptPrivateFinalizeHook(JSContext* cx) 
 {
diff --git a/js/src/jsapi.h b/js/src/jsapi.h
index 2714533354..b4ffd52c6f 100644
--- a/js/src/jsapi.h
+++ b/js/src/jsapi.h
@@ -4410,6 +4410,13 @@ SetScriptPrivate(JSScript* script, const JS::Value& value);
 extern JS_PUBLIC_API(JS::Value)
 GetScriptPrivate(JSScript* script);
 
+/*
+ * Return the private value associated with currently executing script or
+ * module, or undefined if there is no such script.
+ */
+extern JS_PUBLIC_API(JS::Value)
+GetScriptedCallerPrivate(JSContext* cx);
+
 /**
  * A hook that's called whenever a script or module which has a private value
  * set with SetScriptPrivate() or SetModulePrivate() is finalized. This can be