diff --git a/browser/main/lib/ConfigManager.js b/browser/main/lib/ConfigManager.js
index ee8a57c7..79fe0f5f 100644
--- a/browser/main/lib/ConfigManager.js
+++ b/browser/main/lib/ConfigManager.js
@@ -53,6 +53,7 @@ export const DEFAULT_CONFIG = {
     latexInlineClose: '$',
     latexBlockOpen: '$$',
     latexBlockClose: '$$',
+    plantUMLServerAddress: 'http://www.plantuml.com/plantuml',
     scrollPastEnd: false,
     smartQuotes: true,
     sanitize: 'STRICT' // 'STRICT', 'ALLOW_STYLES', 'NONE'