diff --git a/check.go b/check.go
index 28b091a..934d947 100644
--- a/check.go
+++ b/check.go
@@ -76,7 +76,7 @@ func (c *Config) Run() (rc int, output string, err error) {
 			return
 		}
 
-		values.Set("siteIDs", siteID)
+		values.Set("siteIds", siteID)
 	}
 
 	if c.ComputerName != "" {