diff --git a/Cargo.toml b/Cargo.toml
index ee7b70f..8751dc2 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,6 +16,9 @@ byteorder = { version = "1", default-features = false }
 heapsize = { version = "0.4", optional = true }
 rustc-hex = { version = "1.0", optional = true }
 
+[dev-dependencies]
+crunchy = "0.1.5"
+
 [features]
 std = ["rustc-hex"]
 heapsizeof = ["heapsize"]
diff --git a/examples/modular.rs b/examples/modular.rs
index 06a808a..1db193f 100644
--- a/examples/modular.rs
+++ b/examples/modular.rs
@@ -6,9 +6,16 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+#[cfg(feature="std")]
+extern crate core;
+
+#[macro_use]
+extern crate crunchy;
+
+#[macro_use]
 extern crate uint;
 
-use uint::U256;
+construct_uint!(U256, 32);
 
 fn main() {
 	// Example modular arithmetic using bigint U256 primitives