diff --git a/pidfile.go b/pidfile.go
index dd667a8..337a6ef 100644
--- a/pidfile.go
+++ b/pidfile.go
@@ -33,7 +33,7 @@ func getPidProcess(path string) (*os.Process, error) {
 
 func checkPidFileAlreadyExists(path string) error {
 	if pidString, err := ioutil.ReadFile(path); err == nil {
-		if pid, err := strconv.Atoi(string(pidString)); err == nil {
+		if _, err := strconv.Atoi(string(pidString)); err == nil {
 			if _, err := os.Stat(filepath.Join("/proc", string(pid))); err == nil {
 				return fmt.Errorf("pid process is running")
 			}