diff --git a/info.go b/info.go
index 0fae335..f8c0abf 100644
--- a/info.go
+++ b/info.go
@@ -9,6 +9,6 @@ func getg() *g
 // GoroutineId return id of current goroutine.
 // It's guaranteed to be unique globally during app's life time.
 func GoroutineId() int64 {
-    gp := getg()
-    return gp.goid
+	gp := getg()
+	return gp.goid
 }
diff --git a/info_test.go b/info_test.go
index 16f34ee..d1adca5 100644
--- a/info_test.go
+++ b/info_test.go
@@ -5,43 +5,43 @@
 package goroutine
 
 import (
-    "testing"
-    "time"
-    "fmt"
-    "math/rand"
+	"fmt"
+	"math/rand"
+	"testing"
+	"time"
 )
 
 func TestGoroutineIdConsistency(t *testing.T) {
-    cnt := 10
-    exit := make(chan error)
-
-    for i := 0; i < cnt; i++ {
-        go func(n int) {
-            id1 := GoroutineId()
-            time.Sleep(time.Duration(rand.Int63n(100)) * time.Millisecond)
-            id2 := GoroutineId()
-
-            if id1 != id2 {
-                exit <- fmt.Errorf("Inconsistent goroutine id. [old:%v] [new:%v]", id1, id2)
-                return
-            }
-
-            exit <- nil
-        }(i)
-    }
-
-    failed := false
-
-    for i := 0; i < cnt; i++ {
-        err := <-exit
-
-        if err != nil {
-            t.Logf("Found error. [err:%v]", err)
-            failed = true
-        }
-    }
-
-    if failed {
-        t.Fatalf("Test failed.")
-    }
+	cnt := 10
+	exit := make(chan error)
+
+	for i := 0; i < cnt; i++ {
+		go func(n int) {
+			id1 := GoroutineId()
+			time.Sleep(time.Duration(rand.Int63n(100)) * time.Millisecond)
+			id2 := GoroutineId()
+
+			if id1 != id2 {
+				exit <- fmt.Errorf("Inconsistent goroutine id. [old:%v] [new:%v]", id1, id2)
+				return
+			}
+
+			exit <- nil
+		}(i)
+	}
+
+	failed := false
+
+	for i := 0; i < cnt; i++ {
+		err := <-exit
+
+		if err != nil {
+			t.Logf("Found error. [err:%v]", err)
+			failed = true
+		}
+	}
+
+	if failed {
+		t.Fatalf("Test failed.")
+	}
 }
diff --git a/opaque.go b/opaque.go
index 8b79a1f..3bc4666 100644
--- a/opaque.go
+++ b/opaque.go
@@ -6,12 +6,12 @@ package goroutine
 
 import "unsafe"
 
-const ptrSize = 4 << (^uintptr(0) >> 63)             // unsafe.Sizeof(uintptr(0)) but an ideal const
-const regSize = 4 << (^uintreg(0) >> 63)             // unsafe.Sizeof(uintreg(0)) but an ideal const
+const ptrSize = 4 << (^uintptr(0) >> 63) // unsafe.Sizeof(uintptr(0)) but an ideal const
+const regSize = 4 << (^uintreg(0) >> 63) // unsafe.Sizeof(uintreg(0)) but an ideal const
 
-type mcache struct {}
-type typeAlg struct {}
-type traceBuf struct {}
+type mcache struct{}
+type typeAlg struct{}
+type traceBuf struct{}
 
 type gcMarkWorkerMode int
 
diff --git a/runtime2.go b/runtime2.go
index 736bedc..443cf1b 100644
--- a/runtime2.go
+++ b/runtime2.go
@@ -129,6 +129,7 @@ type guintptr uintptr
 
 func (gp guintptr) ptr() *g   { return (*g)(unsafe.Pointer(gp)) }
 func (gp *guintptr) set(g *g) { *gp = guintptr(unsafe.Pointer(g)) }
+
 // func (gp *guintptr) cas(old, new guintptr) bool {
 // 	return casuintptr((*uintptr)(unsafe.Pointer(gp)), uintptr(old), uintptr(new))
 // }