diff --git a/src/models/Donation.ts b/src/models/Donation.ts
index 3ccdafc..87f4e80 100644
--- a/src/models/Donation.ts
+++ b/src/models/Donation.ts
@@ -31,6 +31,5 @@ export abstract class Donation {
    * The donation's amount in cents (or whatever your currency's smallest unit is.).
    * The exact implementation may differ for each type of donation.
    */
-  @IsInt()
-  amount: number;
+  abstract amount: number;
 }
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