diff --git a/core/build_id.mk b/core/build_id.mk
index dd020250292c0b694278bab807dcd74a0bcd6a28..0e8e2cf4bf9cba8065936f1ed6dad36e2edfaff6 100644
--- a/core/build_id.mk
+++ b/core/build_id.mk
@@ -18,4 +18,4 @@
 # (like "CRB01").  It must be a single word, and is
 # capitalized by convention.
 
-export BUILD_ID=LDW13B
+export BUILD_ID=MASTER