diff --git a/qemu_v8.mk b/qemu_v8.mk
index b66b001..b3c370f 100644
--- a/qemu_v8.mk
+++ b/qemu_v8.mk
@@ -353,6 +353,11 @@
 OPTEE_OS_COMMON_FLAGS += CFG_MEMTAG=y
 endif
 
+ifneq ($(QEMU_SMP),)
+CFG_TEE_CORE_NB_CORE ?= $(QEMU_SMP)
+OPTEE_OS_COMMON_FLAGS += CFG_TEE_CORE_NB_CORE=$(CFG_TEE_CORE_NB_CORE)
+endif
+
 OPTEE_OS_COMMON_FLAGS += $(OPTEE_OS_COMMON_FLAGS_SPMC_AT_EL_$(SPMC_AT_EL))
 
 optee-os: optee-os-common