diff --git a/main.go b/main.go
index 5a20495..cdcaddd 100644
--- a/main.go
+++ b/main.go
@@ -74,7 +74,7 @@ func GetGroupsOfUser(username string, baseDN string, conn *ldap.Conn) ([]string,
 	searchRequest := ldap.NewSearchRequest(
 		baseDN,
 		ldap.ScopeWholeSubtree, ldap.NeverDerefAliases, 0, 0, false,
-		fmt.Sprintf("(uid=%s)", samAccountName),
+		fmt.Sprintf("(CN=%s)", ldap.EscapeFilter(samAccountName)),
 		[]string{"dn"},
 		nil,
 	)