diff --git a/main.go b/main.go
index 76edb4f..be879e4 100644
--- a/main.go
+++ b/main.go
@@ -11,6 +11,7 @@ import (
 )
 
 func main() {
+	var retCode int = 0
 	fDays := flag.Int("d", 20, "number of days to alert on")
 	fDebug := flag.Bool("D", false, "debug mode")
 
@@ -60,6 +61,7 @@ func main() {
 				log.Warnf("%q : TIME TO RENEW CERTIFICATE (expires in less than %d days)", file, *fDays)
 				log.Infof("%q : %v", file, cert.NotAfter)
 				log.Infof("%q : %v", file, cert.DNSNames)
+				retCode += 1
 			} else {
 				log.Debugf("%q : %v", file, cert.NotAfter)
 				log.Debugf("%q : %v", file, cert.DNSNames)
@@ -67,4 +69,5 @@ func main() {
 		}
 	}
 
+	os.Exit(retCode)
 }