diff --git a/src/internal-packages/explain/lib/components/explain-summary.jsx b/src/internal-packages/explain/lib/components/explain-summary.jsx
index 49bbe6e4186..e112fe1c1fb 100644
--- a/src/internal-packages/explain/lib/components/explain-summary.jsx
+++ b/src/internal-packages/explain/lib/components/explain-summary.jsx
@@ -19,7 +19,7 @@ class ExplainSummary extends React.Component {
     return (
       <div className="explain-summary">
         <h3>Query Performance Summary</h3>
-        <FlexBox alignItems="start">
+        <FlexBox alignItems="flex-start">
           <div className="summary-stats">
             <SummaryStat
               dataLink="nReturned"