diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 483c8f2..691a4bd 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -103,7 +103,7 @@
   # Can be an arbitrary string, but must be a single word.
   #
   # If there is no $PLATFORM_SECURITY_PATCH set, keep it empty.
-  PLATFORM_SECURITY_PATCH :=
+  PLATFORM_SECURITY_PATCH := 2015-09-01
 endif
 
 ifeq "" "$(PLATFORM_BASE_OS)"