diff --git a/Mail/Views/Thread/WebView.swift b/Mail/Views/Thread/WebView.swift
index ac3ebbf47..de4f67b48 100644
--- a/Mail/Views/Thread/WebView.swift
+++ b/Mail/Views/Thread/WebView.swift
@@ -29,7 +29,7 @@ enum JavaScriptDeclaration {
     var description: String {
         switch self {
         case .normalizeMessageWidth(let width, let messageUid):
-            return "normalizeMessageWidth(\(width), \(messageUid))"
+            return "normalizeMessageWidth(\(width), '\(messageUid)')"
         case .removeAllProperties:
             return "removeAllProperties()"
         case .documentReadyState: