diff --git a/core/arch/arm/plat-corstone1000/conf.mk b/core/arch/arm/plat-corstone1000/conf.mk
index 98347b143f2..9fa0729d5e9 100644
--- a/core/arch/arm/plat-corstone1000/conf.mk
+++ b/core/arch/arm/plat-corstone1000/conf.mk
@@ -33,8 +33,8 @@ CFG_WITH_ARM_TRUSTED_FW ?= y
 CFG_TEE_CORE_NB_CORE ?= 1
 CFG_TZDRAM_START ?= 0x02002000
 
-# TEE_RAM (OPTEE kernel + DATA) + TA_RAM = 3MB
-CFG_TZDRAM_SIZE  ?= 0x300000
+# TEE_RAM (OP-TEE kernel + DATA) + TA_RAM
+CFG_TZDRAM_SIZE  ?= 0x340000
 CFG_SHMEM_START  ?= 0x86000000
 CFG_SHMEM_SIZE   ?= 0x00200000