diff --git a/config/mist.mk b/config/mist.mk
index 4447e9e3..58825807 100644
--- a/config/mist.mk
+++ b/config/mist.mk
@@ -145,6 +145,7 @@ MIST_CPU_SMALL_CORES ?= 0,1,2,3
 MIST_CPU_BIG_CORES ?= 4,5,6,7
 MIST_ALL_CORES ?= 0-7
 MIST_CPU_BG ?= 0-2
+MIST_CPU_SYS_BG ?= 0-3
 MIST_CPU_FG ?= 0-7
 MIST_CPU_LIMIT_BG ?= 0-1
 MIST_CPU_LIMIT_UI ?= 0-2
@@ -166,6 +167,7 @@ PRODUCT_SYSTEM_PROPERTIES += \
     persist.sys.axion_cpu_small=$(MIST_CPU_SMALL_CORES) \
     persist.sys.axion_cpu_bg=$(MIST_CPU_BG) \
     persist.sys.axion_cpu_limit_bg=$(MIST_CPU_LIMIT_BG) \
+    persist.sys.axion_cpu_sys_bg=$(MIST_CPU_SYS_BG) \
     persist.sys.axion_cpu_fg=$(MIST_CPU_FG) \
     persist.sys.axion_cpu_limit_ui=$(MIST_CPU_LIMIT_UI) \
     persist.sys.axion_cpu_unlimit_ui=$(MIST_ALL_CORES) \