diff --git a/packages/mermaid/src/defaultConfig.ts b/packages/mermaid/src/defaultConfig.ts
index 488493030f..cc2b79a804 100644
--- a/packages/mermaid/src/defaultConfig.ts
+++ b/packages/mermaid/src/defaultConfig.ts
@@ -2271,7 +2271,7 @@ const config: Partial<MermaidConfig> = {
     maxNodeWidth: 200,
   },
   sankey: {
-    width: 800,
+    width: 600,
     height: 400,
     linkColor: 'gradient',
     nodeAlignment: 'justify',