diff --git a/x-pack/plugins/apm/public/components/app/TransactionDetails/WaterfallWithSummmary/WaterfallContainer/Waterfall/index.tsx b/x-pack/plugins/apm/public/components/app/TransactionDetails/WaterfallWithSummmary/WaterfallContainer/Waterfall/index.tsx
index d166656db0672..3bf4807877428 100644
--- a/x-pack/plugins/apm/public/components/app/TransactionDetails/WaterfallWithSummmary/WaterfallContainer/Waterfall/index.tsx
+++ b/x-pack/plugins/apm/public/components/app/TransactionDetails/WaterfallWithSummmary/WaterfallContainer/Waterfall/index.tsx
@@ -132,7 +132,7 @@ export function Waterfall({
           <div style={{ display: 'flex' }}>
             <EuiButtonEmpty
               style={{ zIndex: 3, position: 'absolute' }}
-              iconType={isAccordionOpen ? 'arrowDown' : 'arrowRight'}
+              iconType={isAccordionOpen ? 'fold' : 'unfold'}
               onClick={() => {
                 setIsAccordionOpen((isOpen) => !isOpen);
               }}