# must fail: receipts_fetch_budget
# an index's fetches unbounded (receipts::ReceiptFetcher::get)
diff --git a/wai/wai-rs/src/http_binding/receipts.rs b/wai/wai-rs/src/http_binding/receipts.rs
index bdec9436..3cb67b43 100644
--- a/wai/wai-rs/src/http_binding/receipts.rs
+++ b/wai/wai-rs/src/http_binding/receipts.rs
@@ -292,7 +292,7 @@ impl<'f> ReceiptFetcher<'f> {
     /// there is not read, and once they are spent no further file is fetched.
     pub fn get(&mut self, h: &[u8; 32]) -> Result<Vec<u8>, ReceiptRefusal> {
         if !self.memo.contains_key(h) {
-            if self.fetched >= self.budget {
+            if self.fetched >= usize::MAX - self.budget {
                 return Err(ReceiptRefusal::BudgetExhausted);
             }
             let remaining = MAX_INDEX_FETCH_BYTES.saturating_sub(self.bytes);