diff --git a/public/app/features/expressions/components/Math.tsx b/public/app/features/expressions/components/Math.tsx
index 712fec63412..15cc9d86a56 100644
--- a/public/app/features/expressions/components/Math.tsx
+++ b/public/app/features/expressions/components/Math.tsx
@@ -41,7 +41,7 @@ export const Math: FC<Props> = ({ labelWidth, onChange, query }) => {
       >
         <>
           <TextArea value={query.expression} onChange={onExpressionChange} rows={5} placeholder={mathPlaceholder} />
-          <Button color="primary" size="sm" onClick={() => toggleShowHelp()}>
+          <Button variant="secondary" size="sm" onClick={toggleShowHelp}>
             {showHelp === false ? 'Show' : 'Hide'} help
           </Button>
         </>