diff --git a/core/envsetup.mk b/core/envsetup.mk
index 1704daf..f4be2c7 100644
--- a/core/envsetup.mk
+++ b/core/envsetup.mk
@@ -25,11 +25,13 @@
 #$(warning $(call find_and_earlier,A B C,D))
 
 define version-list
-$(1)PR1 $(1)PD1 $(1)PD2 $(1)PM1 $(1)PM2
+$(1)P1A $(1)P1B $(1)P2A $(1)P2B $(1)D1A $(1)D1B $(1)D2A $(1)D2B $(1)Q1A $(1)Q1B $(1)Q2A $(1)Q2B $(1)Q3A $(1)Q3B
 endef
 
-ALL_VERSIONS := O P Q R S T U V W X Y Z
-ALL_VERSIONS := $(foreach v,$(ALL_VERSIONS),$(call version-list,$(v)))
+PREV_VERSIONS := OPR1 OPD1 OPD2 OPM1 OPM2 PPR1 PPD1 PPD2 PPM1 PPM2 QPR1
+ALL_VERSIONS := Q R S T U V W X Y Z
+ALL_VERSIONS := $(PREV_VERSIONS) $(foreach v,$(ALL_VERSIONS),$(call version-list,$(v)))
+PREV_VERSIONS :=
 
 # Filters ALL_VERSIONS down to the range [$1, $2], and errors if $1 > $2 or $3 is
 # not in [$1, $2]
diff --git a/core/version_defaults.mk b/core/version_defaults.mk
index 0601c2d..9abb108 100644
--- a/core/version_defaults.mk
+++ b/core/version_defaults.mk
@@ -39,9 +39,9 @@
   include $(INTERNAL_BUILD_ID_MAKEFILE)
 endif
 
-DEFAULT_PLATFORM_VERSION := QPR1
-MIN_PLATFORM_VERSION := QPR1
-MAX_PLATFORM_VERSION := QPR1
+DEFAULT_PLATFORM_VERSION := QP1A
+MIN_PLATFORM_VERSION := QP1A
+MAX_PLATFORM_VERSION := QP1A
 
 ALLOWED_VERSIONS := $(call allowed-platform-versions,\
   $(MIN_PLATFORM_VERSION),\
@@ -89,11 +89,11 @@
 # generate the range of allowed SDK versions, so it must have an entry for every
 # unreleased API level targetable by this branch, not just those that are valid
 # lunch targets for this branch.
-PLATFORM_VERSION.QPR1 := 10
+PLATFORM_VERSION.QP1A := 10
 
 # These are the current development codenames, if the build is not a final
 # release build.  If this is a final release build, it is simply "REL".
-PLATFORM_VERSION_CODENAME.QPR1 := Q
+PLATFORM_VERSION_CODENAME.QP1A := Q
 
 ifndef PLATFORM_VERSION
   PLATFORM_VERSION := $(PLATFORM_VERSION.$(TARGET_PLATFORM_VERSION))