diff --git a/packages/mermaid/src/diagrams/class/classDb.ts b/packages/mermaid/src/diagrams/class/classDb.ts
index 52cd03cfc..6d8453dd0 100644
--- a/packages/mermaid/src/diagrams/class/classDb.ts
+++ b/packages/mermaid/src/diagrams/class/classDb.ts
@@ -620,6 +620,7 @@ export const getData = () => {
       padding: config.class!.padding ?? 6,
       cssStyles: [
         'text-align: left',
+        'white-space: nowrap',
         `fill: ${config.themeVariables.noteBkgColor}`,
         `stroke: ${config.themeVariables.noteBorderColor}`,
       ],