diff --git a/include/ircd/js/string.h b/include/ircd/js/string.h
index c1d2493ba..15eb560de 100644
--- a/include/ircd/js/string.h
+++ b/include/ircd/js/string.h
@@ -114,6 +114,7 @@ template<lifetime L> std::ostream & operator<<(std::ostream &os, const string<L>
 
 using string = basic::string<lifetime::stack>;
 using heap_string = basic::string<lifetime::heap>;
+using persist_string = basic::string<lifetime::persist>;
 
 //
 // Implementation
diff --git a/include/ircd/js/trap.h b/include/ircd/js/trap.h
index b9b8e3a4b..da32ed7a8 100644
--- a/include/ircd/js/trap.h
+++ b/include/ircd/js/trap.h
@@ -33,7 +33,7 @@ class trap
 	JSPropertySpec ps[2];
 	JSFunctionSpec fs[2];
 	std::unique_ptr<JSClass> _class;
-	std::map<heap_string, trap *, heap_string::less> children;
+	std::map<persist_string, trap *, persist_string::less> children;
 
 	// Override these to define JS objects in C
 	virtual value on_call(object::handle, const args &);