diff --git a/packages/core-components/src/layout/Header/Header.tsx b/packages/core-components/src/layout/Header/Header.tsx
index cb47550b6e..4b7d59d3c2 100644
--- a/packages/core-components/src/layout/Header/Header.tsx
+++ b/packages/core-components/src/layout/Header/Header.tsx
@@ -113,7 +113,7 @@ type Props = {
   tooltip?: string;
   type?: string;
   typeLink?: string;
-  className: string | '';
+  className?: string | '';
 };
 
 type TypeFragmentProps = {
diff --git a/packages/core-components/src/layout/HeaderTabs/HeaderTabs.tsx b/packages/core-components/src/layout/HeaderTabs/HeaderTabs.tsx
index 794f26d44f..2e6d6213fc 100644
--- a/packages/core-components/src/layout/HeaderTabs/HeaderTabs.tsx
+++ b/packages/core-components/src/layout/HeaderTabs/HeaderTabs.tsx
@@ -67,7 +67,7 @@ type HeaderTabsProps = {
   tabs: Tab[];
   onChange?: (index: number) => void;
   selectedIndex?: number;
-  className: string | '';
+  className?: string | '';
 };
 
 /**