diff --git a/qemu/target/i386/cpu.h b/qemu/target/i386/cpu.h
index 4a9a0c71..15899930 100644
--- a/qemu/target/i386/cpu.h
+++ b/qemu/target/i386/cpu.h
@@ -332,6 +332,7 @@
 #define MSR_IA32_APICBASE_BASE          (0xfffffU<<12)
 #define MSR_IA32_FEATURE_CONTROL        0x0000003a
 #define MSR_TSC_ADJUST                  0x0000003b
+#define MSR_IA32_SPEC_CTRL              0x48
 #define MSR_IA32_TSCDEADLINE            0x6e0
 
 #define FEATURE_CONTROL_LOCKED                    (1<<0)
@@ -1075,6 +1076,8 @@ typedef struct CPUX86State {
 
     uint32_t pkru;
 
+    uint64_t spec_ctrl;
+
     /* End of state preserved by INIT (dummy marker).  */
     //struct {} end_init_save;
     int end_init_save;