diff --git a/constant/constant.go b/constant/constant.go
index 8a55d1c1..d552cb47 100644
--- a/constant/constant.go
+++ b/constant/constant.go
@@ -55,4 +55,7 @@ const (
 
 	// ServerTypePseudo is used for ServerInfo.Type, r.Family
 	ServerTypePseudo = "pseudo"
+
+	// DeepSecurity
+	DeepSecurity = "deepsecurity"
 )
diff --git a/scanner/base.go b/scanner/base.go
index f2ca134b..95d0e3c6 100644
--- a/scanner/base.go
+++ b/scanner/base.go
@@ -357,15 +357,13 @@ func (l *base) detectDeepSecurity() (string, error) {
 	return "", xerrors.Errorf("Failed to detect deepsecurity %s", l.ServerInfo.ServerName)
 }
 
-const deepSecurity string = "deepsecurity"
-
 func (l *base) detectIPS() {
 	ips := map[string]string{}
 	fingerprint, err := l.detectDeepSecurity()
 	if err != nil {
 		return
 	}
-	ips[deepSecurity] = fingerprint
+	ips[constant.DeepSecurity] = fingerprint
 	l.ServerInfo.IPSIdentifiers = ips
 }