diff --git a/graph/src/util/cache_weight.rs b/graph/src/util/cache_weight.rs
index b560906fdc0..479433fd31a 100644
--- a/graph/src/util/cache_weight.rs
+++ b/graph/src/util/cache_weight.rs
@@ -140,7 +140,7 @@ impl CacheWeight for BigDecimal {
 
 impl CacheWeight for BigInt {
     fn indirect_weight(&self) -> usize {
-        self.bits() / 8
+        (self.bits() + 7) / 8
     }
 }