diff --git a/x-pack/plugins/security_solution/public/timelines/components/timeline/expandable_event/index.tsx b/x-pack/plugins/security_solution/public/timelines/components/timeline/expandable_event/index.tsx
index 27d28aa525d5..9a15d5dadcc9 100644
--- a/x-pack/plugins/security_solution/public/timelines/components/timeline/expandable_event/index.tsx
+++ b/x-pack/plugins/security_solution/public/timelines/components/timeline/expandable_event/index.tsx
@@ -58,7 +58,10 @@ const StyledFlexGroup = styled(EuiFlexGroup)`
 `;
 
 const StyledEuiFlexItem = styled(EuiFlexItem)`
-  overflow: hidden;
+  &.euiFlexItem {
+    flex: 1 0 0;
+    overflow: hidden;
+  }
 `;
 
 export const ExpandableEventTitle = React.memo<ExpandableEventTitleProps>(