diff --git a/src/flex.ts b/src/flex.ts
index 1428c6da5..7a3119c24 100644
--- a/src/flex.ts
+++ b/src/flex.ts
@@ -3,4 +3,5 @@ import { Style } from '@master/style';
 
 export class FlexStyle extends Style {
     static override key = FLEX;
+    static override unit = '';
 }
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