diff --git a/mozilla/client.mk b/mozilla/client.mk
index 8ee1c242e20..b6db5566ac0 100644
--- a/mozilla/client.mk
+++ b/mozilla/client.mk
@@ -404,7 +404,7 @@ MODULES_all :=                                  \
 # and commit this file on that tag.
 #MOZ_CO_TAG          = <tag>
 NSPR_CO_TAG          = NSPRPUB_PRE_4_2_CLIENT_BRANCH
-NSS_CO_TAG           = NSS_3_11_5_BETA2
+NSS_CO_TAG           = NSS_3_11_5_BETA1
 LDAPCSDK_CO_TAG      = ldapcsdk_5_17_client_branch
 LOCALES_CO_TAG       =