diff --git a/js/src/jsobj.cpp b/js/src/jsobj.cpp
index ac6da07ebdb5..e4ba531bdb03 100644
--- a/js/src/jsobj.cpp
+++ b/js/src/jsobj.cpp
@@ -3851,3 +3851,24 @@ JSObject::maybeConstructorDisplayAtom() const
         return nullptr;
     return displayAtomFromObjectGroup(*group());
 }
+
+bool
+js::SpeciesConstructor(JSContext* cx, HandleObject obj, HandleValue defaultCtor, MutableHandleValue pctor)
+{
+    HandlePropertyName shName = cx->names().SpeciesConstructor;
+    RootedValue func(cx);
+    if (!GlobalObject::getSelfHostedFunction(cx, cx->global(), shName, shName, 2, &func))
+        return false;
+    InvokeArgs args(cx);
+    if (!args.init(2))
+        return false;
+    args.setCallee(func);
+    args.setThis(UndefinedValue());
+    args[0].setObject(*obj);
+    args[1].set(defaultCtor);
+    if (!Invoke(cx, args))
+        return false;
+
+    pctor.set(args.rval());
+    return true;
+}
diff --git a/js/src/jsobj.h b/js/src/jsobj.h
index ebe506eaca66..42b8be427053 100644
--- a/js/src/jsobj.h
+++ b/js/src/jsobj.h
@@ -1336,6 +1336,9 @@ FreezeObject(JSContext* cx, HandleObject obj)
 extern bool
 TestIntegrityLevel(JSContext* cx, HandleObject obj, IntegrityLevel level, bool* resultp);
 
+extern bool
+SpeciesConstructor(JSContext* cx, HandleObject obj, HandleValue defaultCtor, MutableHandleValue pctor);
+
 }  /* namespace js */
 
 #endif /* jsobj_h */
diff --git a/js/src/vm/CommonPropertyNames.h b/js/src/vm/CommonPropertyNames.h
index 7fa17e3913d2..3695ec67747a 100644
--- a/js/src/vm/CommonPropertyNames.h
+++ b/js/src/vm/CommonPropertyNames.h
@@ -235,6 +235,7 @@
     macro(shape, shape, "shape") \
     macro(size, size, "size") \
     macro(source, source, "source") \
+    macro(SpeciesConstructor, SpeciesConstructor, "SpeciesConstructor") \
     macro(stack, stack, "stack") \
     macro(star, star, "*") \
     macro(starDefaultStar, starDefaultStar, "*default*") \