diff --git a/qemu/target-i386/cpu.h b/qemu/target-i386/cpu.h
index 635c0f81..5e8f8fa9 100644
--- a/qemu/target-i386/cpu.h
+++ b/qemu/target-i386/cpu.h
@@ -736,7 +736,7 @@ typedef union {
     uint16_t _w[4];
     uint32_t _l[2];
     float32 _s[2];
-    uint64_t q;
+    uint64_t _q[1];
 } MMXReg;
 
 typedef struct BNDReg {
@@ -774,7 +774,7 @@ typedef struct BNDCSReg {
 #define MMX_L(n) _l[n]
 #define MMX_S(n) _s[n]
 #endif
-#define MMX_Q(n) q
+#define MMX_Q(n) _q[n]
 
 typedef union {
     floatx80 QEMU_ALIGN(16, d);