diff --git a/src/arch/x86_64/driver/apic/ioapic.rs b/src/arch/x86_64/driver/apic/ioapic.rs
index 9d0adc9..755e99d 100644
--- a/src/arch/x86_64/driver/apic/ioapic.rs
+++ b/src/arch/x86_64/driver/apic/ioapic.rs
@@ -4,7 +4,7 @@
 /// http://www.intel.com/design/chipsets/datashts/29056601.pdf
 /// See also picirq.c.
 
-use redox_syscall::io::{Io, Mmio};
+use super::super::redox_syscall::io::{Io, Mmio};
 use bit_field::BitField;
 use arch::interrupt::consts::T_IRQ0;
 use spin::Mutex;
diff --git a/src/arch/x86_64/driver/mod.rs b/src/arch/x86_64/driver/mod.rs
index 65e1f57..4be8d11 100644
--- a/src/arch/x86_64/driver/mod.rs
+++ b/src/arch/x86_64/driver/mod.rs
@@ -1,3 +1,5 @@
+extern crate syscall as redox_syscall;
+
 pub mod vga;
 pub mod acpi;
 pub mod apic;
diff --git a/src/arch/x86_64/driver/pic.rs b/src/arch/x86_64/driver/pic.rs
index 3ef42c1..96f8643 100644
--- a/src/arch/x86_64/driver/pic.rs
+++ b/src/arch/x86_64/driver/pic.rs
@@ -1,6 +1,6 @@
 // Copy from Redox
 
-use redox_syscall::io::*;
+use super::redox_syscall::io::*;
 use spin::Mutex;
 
 static MASTER: Mutex<Pic> = Mutex::new(Pic::new(0x20));
diff --git a/src/arch/x86_64/driver/pit.rs b/src/arch/x86_64/driver/pit.rs
index 01c91a0..2b85923 100644
--- a/src/arch/x86_64/driver/pit.rs
+++ b/src/arch/x86_64/driver/pit.rs
@@ -1,4 +1,4 @@
-use redox_syscall::io::{Io, Pio};
+use super::redox_syscall::io::{Io, Pio};
 
 static mut PIT: Pit = Pit::new(0x40);
 
diff --git a/src/arch/x86_64/driver/serial.rs b/src/arch/x86_64/driver/serial.rs
index bfe9b24..28c9173 100644
--- a/src/arch/x86_64/driver/serial.rs
+++ b/src/arch/x86_64/driver/serial.rs
@@ -1,9 +1,10 @@
 // Copy from Redox
+extern crate uart_16550;
 
 use core::fmt::{self, Write};
-use redox_syscall::io::{Io, Pio};
+use super::redox_syscall::io::{Io, Pio};
 use spin::Mutex;
-use uart_16550::SerialPort;
+use self::uart_16550::SerialPort;
 
 pub static COM1: Mutex<SerialPort> = Mutex::new(SerialPort::new(0x3F8));
 pub static COM2: Mutex<SerialPort> = Mutex::new(SerialPort::new(0x2F8));
diff --git a/src/arch/x86_64/memory.rs b/src/arch/x86_64/memory.rs
index bdc7272..00db06e 100644
--- a/src/arch/x86_64/memory.rs
+++ b/src/arch/x86_64/memory.rs
@@ -2,8 +2,8 @@ use bit_allocator::{BitAlloc, BitAlloc64K};
 use consts::KERNEL_OFFSET;
 // Depends on kernel
 use memory::{active_table, FRAME_ALLOCATOR, init_heap, MemoryArea, MemoryAttr, MemorySet, Stack};
-use multiboot2::{ElfSection, ElfSectionFlags, ElfSectionsTag};
-use multiboot2::BootInformation;
+use super::multiboot2::{ElfSection, ElfSectionFlags, ElfSectionsTag};
+use super::multiboot2::BootInformation;
 use ucore_memory::PAGE_SIZE;
 use ucore_memory::paging::PageTable;
 
diff --git a/src/arch/x86_64/mod.rs b/src/arch/x86_64/mod.rs
index 5a5f775..58b1ee3 100644
--- a/src/arch/x86_64/mod.rs
+++ b/src/arch/x86_64/mod.rs
@@ -1,5 +1,6 @@
+extern crate multiboot2;
+
 use memory::MemorySet;
-use multiboot2;
 
 pub mod driver;
 pub mod cpu;
diff --git a/src/lib.rs b/src/lib.rs
index 03164ab..bbf123f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -30,18 +30,12 @@ extern crate lazy_static;
 extern crate linked_list_allocator;
 #[macro_use]
 extern crate log;
-#[cfg(target_arch = "x86_64")]
-extern crate multiboot2;
 #[macro_use]
 extern crate once;
 extern crate rlibc;
 #[cfg(target_arch = "x86_64")]
 extern crate simple_filesystem;
 extern crate spin;
-#[cfg(target_arch = "x86_64")]
-extern crate syscall as redox_syscall;
-#[cfg(target_arch = "x86_64")]
-extern crate uart_16550;
 extern crate ucore_memory;
 extern crate volatile;
 #[macro_use]