diff --git a/parser/parser.go b/parser/parser.go
index 3639ed0..6f7cc22 100644
--- a/parser/parser.go
+++ b/parser/parser.go
@@ -5,6 +5,7 @@ import (
 	"go/ast"
 	"go/parser"
 	"go/token"
+	"os"
 	"os/exec"
 	"strings"
 )
@@ -73,7 +74,7 @@ func (p *Parser) Parse(fname string, isDir bool) error {
 
 	fset := token.NewFileSet()
 	if isDir {
-		packages, err := parser.ParseDir(fset, fname, nil, parser.ParseComments)
+		packages, err := parser.ParseDir(fset, fname, excludeTestFiles, parser.ParseComments)
 		if err != nil {
 			return err
 		}
@@ -96,3 +97,7 @@ func getDefaultGoPath() (string, error) {
 	output, err := exec.Command("go", "env", "GOPATH").Output()
 	return string(bytes.TrimSpace(output)), err
 }
+
+func excludeTestFiles(fi os.FileInfo) bool {
+	return !strings.HasSuffix(fi.Name(), "_test.go")
+}