diff --git a/p_m_go1.19.go b/p_m_go1.19.go
index 04fe151..7529b8b 100644
--- a/p_m_go1.19.go
+++ b/p_m_go1.19.go
@@ -13,8 +13,8 @@
 // permissions and limitations under the License. See the AUTHORS file
 // for names of contributors.
 
-//go:build gc && go1.19 && !go1.20
-// +build gc,go1.19,!go1.20
+//go:build gc && go1.19 && !go1.21
+// +build gc,go1.19,!go1.21
 
 package goid