diff --git a/packages/expandable-react/src/ExpandablePanel.tsx b/packages/expandable-react/src/ExpandablePanel.tsx
index 452a129dfdd..f2bb225cc69 100644
--- a/packages/expandable-react/src/ExpandablePanel.tsx
+++ b/packages/expandable-react/src/ExpandablePanel.tsx
@@ -17,11 +17,14 @@ export const ExpandablePanel = Object.assign(
             as = "details",
             variant = "fill",
             open: controlledOpen,
+            defaultOpen,
             onOpenChange,
             ...rest
         } = props;
 
-        const [uncontrolledOpen, setUncontrolledOpen] = useState(false);
+        const [uncontrolledOpen, setUncontrolledOpen] = useState(
+            defaultOpen || false,
+        );
         const [contentIsVisible, setContentIsVisible] = useState(false);
         const [expanderHeight, setExpanderHeight] = useState(0);
 
diff --git a/packages/expandable-react/src/types.ts b/packages/expandable-react/src/types.ts
index 39630095f13..f70f46178fe 100644
--- a/packages/expandable-react/src/types.ts
+++ b/packages/expandable-react/src/types.ts
@@ -10,6 +10,10 @@ export type ExpandablePanelProps<ElementType extends React.ElementType> =
         {
             variant?: "fill" | "stroke";
             open?: boolean;
+            /*
+             * Initiell state av content.
+             */
+            defaultOpen?: boolean;
             onOpenChange?: (open: boolean) => void;
         }
     >;
diff --git a/packages/jokul/src/components/expander/ExpandablePanel.tsx b/packages/jokul/src/components/expander/ExpandablePanel.tsx
index 49b3529c9e8..7d9839b4ce6 100644
--- a/packages/jokul/src/components/expander/ExpandablePanel.tsx
+++ b/packages/jokul/src/components/expander/ExpandablePanel.tsx
@@ -17,11 +17,14 @@ export const ExpandablePanel = Object.assign(
             as = "details",
             variant = "fill",
             open: controlledOpen,
+            defaultOpen,
             onOpenChange,
             ...rest
         } = props;
 
-        const [uncontrolledOpen, setUncontrolledOpen] = useState(false);
+        const [uncontrolledOpen, setUncontrolledOpen] = useState(
+            defaultOpen || false,
+        );
         const [contentIsVisible, setContentIsVisible] = useState(false);
         const [expanderHeight, setExpanderHeight] = useState(0);
 
diff --git a/packages/jokul/src/components/expander/types.ts b/packages/jokul/src/components/expander/types.ts
index 4984b9477ed..e8d34aca0cd 100644
--- a/packages/jokul/src/components/expander/types.ts
+++ b/packages/jokul/src/components/expander/types.ts
@@ -10,6 +10,10 @@ export type ExpandablePanelProps<ElementType extends React.ElementType> =
         {
             variant?: "fill" | "stroke";
             open?: boolean;
+            /*
+             * Initiell state av content.
+             */
+            defaultOpen?: boolean;
             onOpenChange?: (open: boolean) => void;
         }
     >;