diff --git a/Cargo.toml b/Cargo.toml
index dc575a9..c4839d5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -15,6 +15,5 @@ qimalloc = { version = "0.1", optional = true }
 [features]
 default = ["std", "wee_alloc"]
 std = []
-debug = []
 experimental = []
 eth2 = []
diff --git a/README.md b/README.md
index 1ce4205..aff29b7 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,6 @@ Other modules are available as well, outside of the prelude. Refer to the docume
 `ewasm-rust-api` builds with various feature sets:
 - `default`: Builds with `wee_alloc` as the global allocator and with the Rust standard library.
 - `qimalloc`: Builds with [qimalloc](https://github.com/wasmx/qimalloc) as the global allocator.
-- `debug`: Exposes the debugging interface.
 - `experimental`: Exposes the experimental bignum system library API.
 
 To enable specific features include the dependency as follows:
diff --git a/circle.yml b/circle.yml
index 939017d..21f142f 100644
--- a/circle.yml
+++ b/circle.yml
@@ -35,11 +35,9 @@ jobs:
              cargo build --release --no-default-features --features wee_alloc
              cargo build --release --no-default-features --features qimalloc
              # different feature sets
-             cargo build --release --features debug
-             cargo build --release --no-default-features --features debug
              cargo build --release --features experimental
              cargo build --release --no-default-features --features experimental
-             cargo build --release --features experimental,debug
-             cargo build --release --no-default-features --features experimental,debug
              cargo build --release --features eth2
              cargo build --release --no-default-features --features eth2
+             cargo build --release --features experimental,eth2
+             cargo build --release --no-default-features --features experimental,eth2
diff --git a/src/lib.rs b/src/lib.rs
index 9e7e48c..5912664 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -10,7 +10,6 @@
 //! library.
 //! - `qimalloc`: Builds with [qimalloc](https://github.com/wasmx/qimalloc) as the global
 //! allocator.
-//! - `debug`: Exposes the debugging interface.
 //! - `experimental`: Exposes the experimental bignum system library API.
 //!
 //! # Examples
@@ -58,7 +57,6 @@ mod utils;
 
 pub mod types;
 
-#[cfg(feature = "debug")]
 pub mod debug;
 
 #[cfg(feature = "experimental")]
@@ -86,7 +84,6 @@ pub mod prelude {
     #[cfg(not(feature = "std"))]
     pub use crate::convert::*;
 
-    #[cfg(feature = "debug")]
     pub use crate::debug;
 
     #[cfg(feature = "experimental")]