diff --git a/.travis.yml b/.travis.yml
index 6170609..50b5ef2 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,13 +1,12 @@
 language: rust
 
 rust:
-    - nightly
+    - nightly-2018-04-01
 
 cache: 
   cargo: true
 
 before_script:
-  - rustup override set nightly-2018-04-01
   - rustup component add rust-src
   - (test -x $HOME/.cargo/bin/cargo-install-update || cargo install cargo-update)
   - (test -x $HOME/.cargo/bin/xargo || cargo install xargo)
diff --git a/Makefile b/Makefile
index 0733f23..142db7c 100644
--- a/Makefile
+++ b/Makefile
@@ -26,9 +26,9 @@ endif
 
 
 ifeq ($(OS),Windows_NT)
-	uname := Win32
+uname := Win32
 else
-	uname := $(shell uname)
+uname := $(shell uname)
 endif
 
 ifeq ($(uname), Linux)
@@ -82,13 +82,13 @@ docker_image ?= blog_os
 tag ?= 0.1
 pwd ?= $(realpath ./)
 ifeq ($(OS),Windows_NT)
-	uid ?= 0
-	gid ?= 0
-	innerpwd ?= /root/blog_os
+uid ?= 0
+gid ?= 0
+innerpwd ?= /root/blog_os
 else
-	uid ?= $(shell id -u)
-	gid ?= $(shell id -g)
-	innerpwd ?= pwd
+uid ?= $(shell id -u)
+gid ?= $(shell id -g)
+innerpwd ?= pwd
 endif
 docker_cargo_volume ?=  blogos-$(uid)-$(gid)-cargo
 docker_rustup_volume ?=  blogos-$(uid)-$(gid)-rustup
diff --git a/build.rs b/build.rs
index ee557b4..293f4b8 100644
--- a/build.rs
+++ b/build.rs
@@ -4,5 +4,6 @@ fn main() {
     cc::Build::new()
 		.file("src/arch/x86_64/driver/apic/lapic.c")
 		.file("src/arch/x86_64/driver/keyboard/keyboard.c")
+		.flag("-mcmodel=large")
 		.compile("cobj");
 }
\ No newline at end of file