diff --git a/hw/hppa/dino.c b/hw/hppa/dino.c
index 8868e31793..be799aad43 100644
--- a/hw/hppa/dino.c
+++ b/hw/hppa/dino.c
@@ -94,7 +94,7 @@ static const uint32_t reg800_keep_bits[DINO800_REGS] = {
     MAKE_64BIT_MASK(0, 32), /* Undefined */
     MAKE_64BIT_MASK(0, 8),  /* MLTIM */
     MAKE_64BIT_MASK(0, 30), /* BRDG_FEAT */
-    MAKE_64BIT_MASK(0, 25), /* PCIROR */
+    MAKE_64BIT_MASK(0, 24), /* PCIROR */
     MAKE_64BIT_MASK(0, 22), /* PCIWOR */
     MAKE_64BIT_MASK(0, 32), /* Undocumented */
     MAKE_64BIT_MASK(0, 9),  /* TLTIM */