diff --git a/src/fixed_width_ints.rs b/src/fixed_width_ints.rs
index 1900833ff78f..93439f989c70 100644
--- a/src/fixed_width_ints.rs
+++ b/src/fixed_width_ints.rs
@@ -1,6 +1,7 @@
 //! This module contains type aliases for C's fixed-width integer types .
 //!
 //! These aliases are deprecated: use the Rust types instead.
+use crate::prelude::*;
 
 #[deprecated(since = "0.2.55", note = "Use i8 instead.")]
 pub type int8_t = i8;
diff --git a/src/teeos/mod.rs b/src/teeos/mod.rs
index a46587d11110..290ab8906232 100644
--- a/src/teeos/mod.rs
+++ b/src/teeos/mod.rs
@@ -4,11 +4,10 @@
 //! when linking is explicitly requested.
 #![allow(non_camel_case_types)]
 #![allow(non_snake_case)]
-
 // only supported on Rust > 1.59, so we can directly reexport c_void from core.
 pub use core::ffi::c_void;
 
-use Option;
+use crate::prelude::*;
 
 pub type c_schar = i8;
 
diff --git a/src/unix/bsd/netbsdlike/netbsd/riscv64.rs b/src/unix/bsd/netbsdlike/netbsd/riscv64.rs
index c823076e21f5..b5e72084d5aa 100644
--- a/src/unix/bsd/netbsdlike/netbsd/riscv64.rs
+++ b/src/unix/bsd/netbsdlike/netbsd/riscv64.rs
@@ -26,7 +26,7 @@ s_no_extra_traits! {
     }
 }
 
-pub(crate) const _ALIGNBYTES: usize = crate::mem::size_of::<c_long>() - 1;
+pub(crate) const _ALIGNBYTES: usize = mem::size_of::<c_long>() - 1;
 
 pub const PT_GETREGS: c_int = PT_FIRSTMACH + 0;
 pub const PT_SETREGS: c_int = PT_FIRSTMACH + 1;
diff --git a/src/unix/bsd/netbsdlike/openbsd/arm.rs b/src/unix/bsd/netbsdlike/openbsd/arm.rs
index 11305470d87b..1e66ed247a2e 100644
--- a/src/unix/bsd/netbsdlike/openbsd/arm.rs
+++ b/src/unix/bsd/netbsdlike/openbsd/arm.rs
@@ -4,6 +4,6 @@ pub type c_long = i32;
 pub type c_ulong = u32;
 pub type c_char = u8;
 
-pub(crate) const _ALIGNBYTES: usize = crate::mem::size_of::<c_double>() - 1;
+pub(crate) const _ALIGNBYTES: usize = mem::size_of::<c_double>() - 1;
 
 pub const _MAX_PAGE_SHIFT: u32 = 12;
diff --git a/src/unix/bsd/netbsdlike/openbsd/powerpc64.rs b/src/unix/bsd/netbsdlike/openbsd/powerpc64.rs
index 977eb840c90a..cb808719fb8e 100644
--- a/src/unix/bsd/netbsdlike/openbsd/powerpc64.rs
+++ b/src/unix/bsd/netbsdlike/openbsd/powerpc64.rs
@@ -1,3 +1,5 @@
+use crate::prelude::*;
+
 pub type c_long = i64;
 pub type c_ulong = u64;
 pub type c_char = u8;
diff --git a/src/unix/redox/mod.rs b/src/unix/redox/mod.rs
index 748dc2f1d715..db854dd6300e 100644
--- a/src/unix/redox/mod.rs
+++ b/src/unix/redox/mod.rs
@@ -82,8 +82,7 @@ s_no_extra_traits! {
 
     pub struct sockaddr_storage {
         pub ss_family: crate::sa_family_t,
-        __ss_padding:
-            [u8; 128 - crate::mem::size_of::<sa_family_t>() - crate::mem::size_of::<c_ulong>()],
+        __ss_padding: [u8; 128 - mem::size_of::<sa_family_t>() - mem::size_of::<c_ulong>()],
         __ss_align: c_ulong,
     }
 }