diff --git a/client.mk b/client.mk
index 5cb201de893..043847ed50d 100644
--- a/client.mk
+++ b/client.mk
@@ -408,7 +408,7 @@ MODULES_all :=                                  \
 # and commit this file on that tag.
 #MOZ_CO_TAG          = <tag>
 NSPR_CO_TAG          = NSPR_HEAD_20070713
-NSS_CO_TAG           = NSS_3_12_ALPHA1A
+NSS_CO_TAG           = NSS_3_12_ALPHA1B
 LDAPCSDK_CO_TAG      = LDAPCSDK_6_0_3_CLIENT_BRANCH
 LOCALES_CO_TAG       =