diff --git a/package/glibc/Config.in b/package/glibc/Config.in
index 1cf2f56758..3038b27d98 100644
--- a/package/glibc/Config.in
+++ b/package/glibc/Config.in
@@ -48,3 +48,4 @@ config BR2_GLIBC_VERSION_STRING
 	default "2.19-svnr25243" if BR2_EGLIBC_VERSION_2_19
 	default "2.19" if BR2_GLIBC_VERSION_2_19
 	default "2.20" if BR2_GLIBC_VERSION_2_20
+	default "2.21" if BR2_GLIBC_VERSION_2_21