diff --git a/src/int/big.rs b/src/int/big.rs
index d3aa7ff64..191c0de53 100644
--- a/src/int/big.rs
+++ b/src/int/big.rs
@@ -101,8 +101,6 @@ macro_rules! impl_common {
 
 impl_common!(i256);
 impl_common!(u256);
-extern crate std;
-use std::dbg;
 
 impl ops::Shr<u32> for u256 {
     type Output = Self;