diff --git a/packages/mermaid/src/defaultConfig.ts b/packages/mermaid/src/defaultConfig.ts
index de4a56f5b..16afc8bb4 100644
--- a/packages/mermaid/src/defaultConfig.ts
+++ b/packages/mermaid/src/defaultConfig.ts
@@ -697,7 +697,7 @@ const config: Partial<MermaidConfig> = {
      *
      * Default value: false
      */
-    compact: undefined,
+    compact: false,
 
     /**
      * | Parameter   | Description | Type    | Required | Values      |