diff --git a/packages/grant-explorer/src/checkoutStore.ts b/packages/grant-explorer/src/checkoutStore.ts
index ffa53e0829..bfe6518f2b 100644
--- a/packages/grant-explorer/src/checkoutStore.ts
+++ b/packages/grant-explorer/src/checkoutStore.ts
@@ -253,7 +253,7 @@ export const useCheckoutStore = create<CheckoutState>()(
               amount: string;
               recipient: string;
               projectRegistryId: string;
-              applicationIndex: string;
+              applicationIndex: number;
               anchorAddress: string;
             }[] = [];
 
@@ -274,7 +274,7 @@ export const useCheckoutStore = create<CheckoutState>()(
                 amount: d.amount,
                 recipient: d.recipient,
                 projectRegistryId: d.projectRegistryId,
-                applicationIndex: app.id,
+                applicationIndex: Number(app.id),
                 anchorAddress: app.anchorAddress,
               });
             });