diff --git a/lib/src/lib.rs b/lib/src/lib.rs
index 7381e2d7..ea1dfc93 100644
--- a/lib/src/lib.rs
+++ b/lib/src/lib.rs
@@ -15,9 +15,6 @@
 extern crate alloc;
 extern crate core;
 
-// #[cfg(any(not(target_os = "zkvm"), not(feature = "std")))]
-// pub mod host;
-
 pub mod builder;
 pub mod consts;
 pub mod input;
diff --git a/primitives/src/access_list.rs b/primitives/src/access_list.rs
index a27f6627..e4e141b8 100644
--- a/primitives/src/access_list.rs
+++ b/primitives/src/access_list.rs
@@ -11,8 +11,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-// #[cfg(not(feature = "std"))]
-// use crate::no_std_preflight::*;
 
 extern crate alloc;
 extern crate core;
diff --git a/primitives/src/ethers.rs b/primitives/src/ethers.rs
index eb50a3de..d6d15afb 100644
--- a/primitives/src/ethers.rs
+++ b/primitives/src/ethers.rs
@@ -13,8 +13,6 @@
 // limitations under the License.
 
 //! Convert from Ethers types.
-// #[cfg(not(feature = "std"))]
-// use crate::no_std_preflight::*;
 
 extern crate alloc;
 extern crate core;
diff --git a/primitives/src/receipt.rs b/primitives/src/receipt.rs
index 9168a261..175de22d 100644
--- a/primitives/src/receipt.rs
+++ b/primitives/src/receipt.rs
@@ -11,8 +11,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-// #[cfg(not(feature = "std"))]
-// use crate::no_std_preflight::*;
 
 extern crate alloc;
 extern crate core;
diff --git a/primitives/src/revm.rs b/primitives/src/revm.rs
index d684742b..810af621 100644
--- a/primitives/src/revm.rs
+++ b/primitives/src/revm.rs
@@ -13,8 +13,7 @@
 // limitations under the License.
 
 //! Convert to revm types.
-// #[cfg(not(feature = "std"))]
-// use crate::no_std_preflight::*;
+
 
 extern crate alloc;
 extern crate core;
diff --git a/primitives/src/transactions/ethereum.rs b/primitives/src/transactions/ethereum.rs
index 65e8fde5..cef6a187 100644
--- a/primitives/src/transactions/ethereum.rs
+++ b/primitives/src/transactions/ethereum.rs
@@ -11,8 +11,6 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-// #[cfg(not(feature = "std"))]
-// use crate::no_std_preflight::*;
 
 extern crate alloc;
 extern crate core;
diff --git a/primitives/src/trie/mpt.rs b/primitives/src/trie/mpt.rs
index ad5b0a4a..10d1cde0 100644
--- a/primitives/src/trie/mpt.rs
+++ b/primitives/src/trie/mpt.rs
@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-// use crate::no_std_preflight::*;
-
 extern crate alloc;
 extern crate core;