diff --git a/payloads/external/Makefile.inc b/payloads/external/Makefile.inc
index e367cb8866..33df6fb46e 100644
--- a/payloads/external/Makefile.inc
+++ b/payloads/external/Makefile.inc
@@ -187,7 +187,7 @@ $(obj)/UEFIPAYLOAD.fd: $(DOTCONFIG)
 		CONFIG_ECAM_MMCONF_LENGTH=$(CONFIG_ECAM_MMCONF_LENGTH) \
 		CONFIG_PCIEXP_SUPPORT_RESIZABLE_BARS=$(CONFIG_PCIEXP_SUPPORT_RESIZABLE_BARS) \
 		CONFIG_CPU_XTAL_HZ=$(CONFIG_CPU_XTAL_HZ) \
-		CONFIG_SMMSTORE_V2=$(CONFIG_SMMSTORE_v2) \
+		CONFIG_SMMSTORE_V2=$(CONFIG_SMMSTORE_V2) \
 		CONFIG_EDK2_SECURE_BOOT_SUPPORT=$(CONFIG_EDK2_SECURE_BOOT_SUPPORT) \
 		GCC_CC_x86_32=$(GCC_CC_x86_32) \
 		GCC_CC_x86_64=$(GCC_CC_x86_64) \
@@ -229,7 +229,7 @@ $(obj)/ShimmedUniversalPayload.elf: $(DOTCONFIG)
 		CONFIG_ECAM_MMCONF_BASE_ADDRESS=$(CONFIG_ECAM_MMCONF_BASE_ADDRESS) \
 		CONFIG_ECAM_MMCONF_LENGTH=$(CONFIG_ECAM_MMCONF_LENGTH) \
 		CONFIG_CPU_XTAL_HZ=$(CONFIG_CPU_XTAL_HZ) \
-		CONFIG_SMMSTORE_V2=$(CONFIG_SMMSTORE_v2) \
+		CONFIG_SMMSTORE_V2=$(CONFIG_SMMSTORE_V2) \
 		GCC_CC_x86_32=$(GCC_CC_x86_32) \
 		GCC_CC_x86_64=$(GCC_CC_x86_64) \
 		GCC_CC_arm=$(GCC_CC_arm) \