diff --git a/routers/install/install.go b/routers/install/install.go
index 164ce6840565f..441481c1654da 100644
--- a/routers/install/install.go
+++ b/routers/install/install.go
@@ -42,12 +42,10 @@ const (
 	tplPostInstall base.TplName = "post-install"
 )
 
-var supportedDbTypeNames []map[string]string // use a slice to keep order
 func getDbTypeNames() []map[string]string {
-	if supportedDbTypeNames == nil {
-		for _, t := range setting.SupportedDatabaseTypes {
-			supportedDbTypeNames = append(supportedDbTypeNames, map[string]string{"type": t, "name": setting.DatabaseTypeNames[t]})
-		}
+	var supportedDbTypeNames []map[string]string // use a slice to keep order
+	for _, t := range setting.SupportedDatabaseTypes {
+		supportedDbTypeNames = append(supportedDbTypeNames, map[string]string{"type": t, "name": setting.DatabaseTypeNames[t]})
 	}
 	return supportedDbTypeNames
 }