diff --git a/xen/arch/x86/hvm/emulate.c b/xen/arch/x86/hvm/emulate.c
index cc0b84138b..1384a4234b 100644
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -134,7 +134,7 @@ static int hvmemul_do_io(
         p = vio->io_req;
 
         /* Verify the emulation request has been correctly re-issued */
-        if ( (p.type != is_mmio ? IOREQ_TYPE_COPY : IOREQ_TYPE_PIO) ||
+        if ( (p.type != (is_mmio ? IOREQ_TYPE_COPY : IOREQ_TYPE_PIO)) ||
              (p.addr != addr) ||
              (p.size != size) ||
              (p.count != *reps) ||