diff --git a/qemu/target-i386/cpu.h b/qemu/target-i386/cpu.h
index 2f8acf97..15b9869d 100644
--- a/qemu/target-i386/cpu.h
+++ b/qemu/target-i386/cpu.h
@@ -304,7 +304,7 @@
 #define MSR_IA32_APICBASE               0x1b
 #define MSR_IA32_APICBASE_BSP           (1<<8)
 #define MSR_IA32_APICBASE_ENABLE        (1<<11)
-#define MSR_IA32_APICBASE_BASE          (0xfffff<<12)
+#define MSR_IA32_APICBASE_BASE          (0xfffffU<<12)
 #define MSR_IA32_FEATURE_CONTROL        0x0000003a
 #define MSR_TSC_ADJUST                  0x0000003b
 #define MSR_IA32_TSCDEADLINE            0x6e0