diff --git a/ethbloom/Cargo.toml b/ethbloom/Cargo.toml
index 215e669..f99c764 100644
--- a/ethbloom/Cargo.toml
+++ b/ethbloom/Cargo.toml
@@ -11,7 +11,7 @@ repository = "https://github.com/paritytech/primitives"
 [dependencies]
 tiny-keccak = "1.4"
 crunchy = { version = "0.1.6", features = ["limit_256"] }
-fixed-hash = { version = "0.2.1", path = "../fixed-hash" }
+fixed-hash = { version = "0.2.1", path = "../fixed-hash", default-features = false }
 ethereum-types-serialize = { version = "0.2.1", path = "../serialize", optional = true }
 serde = { version = "1.0", optional = true }
 
diff --git a/ethbloom/src/lib.rs b/ethbloom/src/lib.rs
index 1ea977b..78a8d77 100644
--- a/ethbloom/src/lib.rs
+++ b/ethbloom/src/lib.rs
@@ -47,9 +47,12 @@ extern crate serde;
 #[cfg(feature="serialize")]
 use serde::{Serialize, Serializer, Deserialize, Deserializer};
 
-use core::{ops, mem, str};
+use core::{ops, mem};
 use tiny_keccak::keccak256;
 
+#[cfg(feature="std")]
+use core::str;
+
 // 3 according to yellowpaper
 const BLOOM_BITS: u32 = 3;
 const BLOOM_SIZE: usize = 256;
diff --git a/ethereum-types/Cargo.toml b/ethereum-types/Cargo.toml
index dc922cf..46decc7 100644
--- a/ethereum-types/Cargo.toml
+++ b/ethereum-types/Cargo.toml
@@ -11,12 +11,12 @@ build = "build.rs"
 rustc_version = "0.2"
 
 [dependencies]
-uint = { path = "../uint", version = "0.2.1" }
-fixed-hash = { path = "../fixed-hash", version = "0.2" }
-ethbloom = { path = "../ethbloom", version = "0.5.0" }
 crunchy = "0.1.5"
+ethbloom = { path = "../ethbloom", version = "0.5.0", default-features = false }
 ethereum-types-serialize = { version = "0.2.1", path = "../serialize", optional = true }
+fixed-hash = { path = "../fixed-hash", version = "0.2" }
 serde = { version = "1.0", optional = true }
+uint = { path = "../uint", version = "0.2.1", default-features = false }
 
 [features]
 default = ["std", "heapsizeof", "serialize"]