diff --git a/build/mac/build_scripts/MozillaCheckoutList.txt b/build/mac/build_scripts/MozillaCheckoutList.txt
index 463e814f26c49d89c37f8cca4a6ddef8f995b162..577a8bbe951761b12db7b119a4815691862ffbe2 100644
--- a/build/mac/build_scripts/MozillaCheckoutList.txt
+++ b/build/mac/build_scripts/MozillaCheckoutList.txt
@@ -7,15 +7,15 @@
 #   mozilla/gc, , 10/25/2000 12:00:00
 #
 
-mozilla/nsprpub,        	MOZILLA_1_2a_RELEASE
-mozilla/security/nss,   	MOZILLA_1_2a_RELEASE
-mozilla/security/manager,	MOZILLA_1_2a_RELEASE
-mozilla/accessible,		MOZILLA_1_2a_RELEASE
-mozilla/directory/c-sdk,	MOZILLA_1_2a_RELEASE
-mozilla/lib/mac/Instrumentation, MOZILLA_1_2a_RELEASE
-mozilla/gfx2,			MOZILLA_1_2a_RELEASE
-mozilla/modules/libpr0n		MOZILLA_1_2a_RELEASE
-SeaMonkeyAll			MOZILLA_1_2a_RELEASE
+mozilla/nsprpub,        NSPRPUB_PRE_4_2_CLIENT_BRANCH
+mozilla/security/nss,   NSS_CLIENT_TAG
+mozilla/security/manager,
+mozilla/accessible,
+mozilla/directory/c-sdk,    ldapcsdk_50_client_branch
+mozilla/lib/mac/Instrumentation
+mozilla/gfx2
+mozilla/modules/libpr0n
+SeaMonkeyAll
 ## You need this if you want to be able to use SVG
 ## Note that this library is under the LGPL, not the MPL
 #mozilla/other-licenses/libart_lgpl
diff --git a/client.mk b/client.mk
index c463841ea9d58e980a853bd334f67e419c915d6f..c753e2537917a2bde15a309a814c566e2bb3479a 100644
--- a/client.mk
+++ b/client.mk
@@ -52,7 +52,7 @@
 #
 # For branches, uncomment the MOZ_CO_TAG line with the proper tag,
 # and commit this file on that tag.
-MOZ_CO_TAG = MOZILLA_1_2a_RELEASE
+#MOZ_CO_TAG = <tag>
 NSPR_CO_TAG = NSPRPUB_PRE_4_2_CLIENT_BRANCH
 PSM_CO_TAG = #We will now build PSM from the tip instead of a branch.
 NSS_CO_TAG = NSS_CLIENT_TAG