diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index cae8168580..c2304663bb 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -104,7 +104,7 @@ ifeq "" "$(PLATFORM_SECURITY_PATCH)"
   # 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)"