diff --git a/src/security/intel/stm/StmPlatformSmm.c b/src/security/intel/stm/StmPlatformSmm.c
index 69df5cd6b1..9c5ae5264e 100644
--- a/src/security/intel/stm/StmPlatformSmm.c
+++ b/src/security/intel/stm/StmPlatformSmm.c
@@ -70,7 +70,7 @@ int load_stm_image(uintptr_t mseg)
 struct descriptor {
 	uint16_t limit;
 	uintptr_t base;
-} __attribute__((packed));
+} __packed;
 
 static void read_gdtr(struct descriptor *gdtr)
 {