diff --git a/ethbloom/Cargo.toml b/ethbloom/Cargo.toml
index 8b847fb..14d7934 100644
--- a/ethbloom/Cargo.toml
+++ b/ethbloom/Cargo.toml
@@ -21,7 +21,7 @@ rand = { version = "0.4" }
 hex-literal = "0.1.1"
 
 [features]
-default = ["std", "heapsizeof", "serialize", "fixed-hash/libc", "fixed-hash/rustc-hex"]
+default = ["std", "heapsize", "serialize", "fixed-hash/libc", "fixed-hash/rustc-hex"]
 std = ["fixed-hash/std", "crunchy/std"]
 heapsize = ["fixed-hash/heapsize"]
 serialize = ["std", "ethereum-types-serialize", "serde"]