diff --git a/cmd/cover.go b/cmd/cover.go
index b139ff4..fef9874 100644
--- a/cmd/cover.go
+++ b/cmd/cover.go
@@ -18,8 +18,8 @@ package cmd
 
 import (
 	"fmt"
-	"github.com/spf13/viper"
 	log "github.com/sirupsen/logrus"
+	"github.com/spf13/viper"
 	"os"
 	"strings"
 
diff --git a/cmd/profile.go b/cmd/profile.go
index 2817a2f..c1d0918 100644
--- a/cmd/profile.go
+++ b/cmd/profile.go
@@ -19,8 +19,8 @@ package cmd
 import (
 	"bytes"
 	"fmt"
-	"io"
 	log "github.com/sirupsen/logrus"
+	"io"
 	"os"
 
 	"github.com/qiniu/goc/pkg/cover"
diff --git a/pkg/build/build.go b/pkg/build/build.go
index cf80fcd..d40ea88 100644
--- a/pkg/build/build.go
+++ b/pkg/build/build.go
@@ -18,12 +18,13 @@ package build
 
 import (
 	"fmt"
-	"github.com/qiniu/goc/pkg/cover"
-	log "github.com/sirupsen/logrus"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"strings"
+
+	"github.com/qiniu/goc/pkg/cover"
+	log "github.com/sirupsen/logrus"
 )
 
 // Build is to describe the building/installing process of a goc build/install
@@ -51,8 +52,8 @@ func NewBuild(buildflags string, packages string, outputDir string) *Build {
 	if false == b.validatePackageForBuild() {
 		log.Fatalln("packages only support \".\"")
 	}
-	b.Target = b.determineOutputDir(outputDir)
 	b.MvProjectsToTmp()
+	b.Target = b.determineOutputDir(outputDir)
 	return b
 }
 
@@ -79,6 +80,9 @@ func (b *Build) Build() {
 // determineOutputDir, as we only allow . as package name,
 // the binary name is always same as the directory name of current directory
 func (b *Build) determineOutputDir(outputDir string) string {
+	if b.TmpDir == "" {
+		log.Fatalln("Can only be called after Build.MvProjectsToTmp().")
+	}
 	curWorkingDir, err := os.Getwd()
 	if err != nil {
 		log.Fatalf("Cannot get current working directory, the err: %v.", err)
@@ -86,8 +90,11 @@ func (b *Build) determineOutputDir(outputDir string) string {
 	// if
 	if outputDir == "" {
 		_, last := filepath.Split(curWorkingDir)
-		// replace "_" with "-" in the import path
-		last = strings.ReplaceAll(last, "_", "-")
+		if b.IsMod {
+			// in mod, special rule
+			// replace "_" with "-" in the import path
+			last = strings.ReplaceAll(last, "_", "-")
+		}
 		return filepath.Join(curWorkingDir, last)
 	}
 	abs, err := filepath.Abs(outputDir)
diff --git a/pkg/build/gomodules.go b/pkg/build/gomodules.go
index 493a252..f593c8d 100644
--- a/pkg/build/gomodules.go
+++ b/pkg/build/gomodules.go
@@ -19,7 +19,6 @@ package build
 import (
 	log "github.com/sirupsen/logrus"
 
-
 	"github.com/otiai10/copy"
 )
 
diff --git a/pkg/build/legacy.go b/pkg/build/legacy.go
index 13a499f..ed6244a 100644
--- a/pkg/build/legacy.go
+++ b/pkg/build/legacy.go
@@ -48,7 +48,7 @@ func (b *Build) cpLegacyProject() {
 
 // only cp dependency in root(current gopath),
 // skip deps in other GOPATHs
-func (b *Build) cpDepPackages( pkg *cover.Package, visited map[string]bool) {
+func (b *Build) cpDepPackages(pkg *cover.Package, visited map[string]bool) {
 	/*
 		oriGOPATH := os.Getenv("GOPATH")
 		if oriGOPATH == "" {
diff --git a/pkg/cover/server.go b/pkg/cover/server.go
index de96123..721ee05 100644
--- a/pkg/cover/server.go
+++ b/pkg/cover/server.go
@@ -19,9 +19,9 @@ package cover
 import (
 	"bytes"
 	"fmt"
+	log "github.com/sirupsen/logrus"
 	"io"
 	"io/ioutil"
-	log "github.com/sirupsen/logrus"
 	"net"
 	"net/http"
 	"net/url"
diff --git a/tests/e2e/simple_project_test.go b/tests/e2e/simple_project_test.go
index 7245c6c..370838f 100644
--- a/tests/e2e/simple_project_test.go
+++ b/tests/e2e/simple_project_test.go
@@ -55,7 +55,7 @@ var _ = Describe("E2E", func() {
 
 			By("goc build")
 			testProjDir := filepath.Join(TESTS_ROOT, "samples/simple_project")
-			cmd := exec.Command("goc", "build")
+			cmd := exec.Command("goc", "build", "--debuggoc")
 			cmd.Dir = testProjDir
 
 			out, err := cmd.CombinedOutput()
@@ -84,7 +84,7 @@ var _ = Describe("E2E", func() {
 				obj := filepath.Join(dir, "simple-project")
 				fInfo, err := os.Lstat(obj)
 				Expect(err).To(BeNil())
-				Expect(startTime.Before(fInfo.ModTime())).To(Equal(true), "new binary should be generated, not the old one")
+				Expect(startTime.Before(fInfo.ModTime())).To(Equal(true), obj+"new binary should be generated, not the old one")
 
 				cmd := exec.Command("go", "tool", "objdump", "simple-project")
 				cmd.Dir = dir
@@ -114,12 +114,13 @@ var _ = Describe("E2E", func() {
 			GOPATH = testProjDir
 
 			By("goc build")
-			cmd := exec.Command("goc", "build")
+			cmd := exec.Command("goc", "build", "--debuggoc")
 			cmd.Dir = oriWorkingDir
 			// use GOPATH mode to compile project
 			cmd.Env = append(os.Environ(), fmt.Sprintf("GOPATH=%v", GOPATH), "GO111MODULE=off")
 
 			out, err := cmd.CombinedOutput()
+			fmt.Println(string(out))
 			Expect(err).To(BeNil(), "goc build on this project should be successful", string(out), cmd.Dir)
 
 			By("goc install")
@@ -145,7 +146,7 @@ var _ = Describe("E2E", func() {
 			By("check generated binary")
 			objects := []string{GOPATH + "/bin", oriWorkingDir}
 			for _, dir := range objects {
-				obj := filepath.Join(dir, "simple-gopath-project")
+				obj := filepath.Join(dir, "simple_gopath_project")
 				fInfo, err := os.Lstat(obj)
 				Expect(err).To(BeNil())
 				Expect(startTime.Before(fInfo.ModTime())).To(Equal(true), "new binary should be generated, not the old one")