diff --git a/src/Royalties/utils.ts b/src/Royalties/utils.ts
index be33623..7ea3eb5 100644
--- a/src/Royalties/utils.ts
+++ b/src/Royalties/utils.ts
@@ -63,6 +63,10 @@ export const parseRoyaltyPart = (
     throw new Error(`Decimals must be an integer, got ${part.decimals}`)
   }
 
+  if (!Number.isInteger(part.value) && (typeof part.value !== 'bigint')) {
+    throw new Error(`Value must be an integer or bigint, got ${part.value} (${typeof part.value})`)
+  }
+
   if (part.value < 1 || part.value > (2n ** 64n - 1n)) {
     throw new Error(
       `Value must be between 1 and 18446744073709551615 (uint64), got ${part.value}`,