diff --git a/source/gui/scripting/JSInterface_GUITypes.cpp b/source/gui/scripting/JSInterface_GUITypes.cpp
index cebc25e7a1..3cdac32268 100644
--- a/source/gui/scripting/JSInterface_GUITypes.cpp
+++ b/source/gui/scripting/JSInterface_GUITypes.cpp
@@ -118,11 +118,10 @@ bool JSI_GUISize::toString(JSContext* cx, uint argc, JS::Value* vp)
 	}
 	catch (PSERROR_Scripting_ConversionFailed&)
 	{
-		rec.rval().setString(JS_NewStringCopyZ(cx, "<Error converting value to numbers>"));
+		ScriptInterface::ToJSVal(cx, rec.rval(), std::string("<Error converting value to numbers>"));
 		return true;
 	}
-
-	rec.rval().setString(JS_NewStringCopyZ(cx, buffer.c_str()));
+	ScriptInterface::ToJSVal(cx, rec.rval(), buffer);
 	return true;
 }
 
diff --git a/source/gui/scripting/JSInterface_IGUIObject.cpp b/source/gui/scripting/JSInterface_IGUIObject.cpp
index 1ed10f8363..440fcc88b8 100644
--- a/source/gui/scripting/JSInterface_IGUIObject.cpp
+++ b/source/gui/scripting/JSInterface_IGUIObject.cpp
@@ -591,10 +591,7 @@ bool JSI_IGUIObject::toString(JSContext* cx, uint UNUSED(argc), JS::Value* vp)
 	if (!e)
 		return false;
 
-	char buffer[256];
-	snprintf(buffer, 256, "[GUIObject: %s]", e->GetName().c_str());
-	buffer[255] = 0;
-	rec.rval().setString(JS_NewStringCopyZ(cx, buffer));
+	ScriptInterface::ToJSVal(cx, rec.rval(), "[GUIObject: " + e->GetName() + "]");
 	return true;
 }