diff --git a/src/cpu/386_common.c b/src/cpu/386_common.c
index beb6869e9..847408ba8 100644
--- a/src/cpu/386_common.c
+++ b/src/cpu/386_common.c
@@ -1605,6 +1605,9 @@ checkio(uint32_t port, int mask)
 {
     uint32_t t;
 
+    if (!(tr.access & 0x08))
+        return 0;
+
     cpl_override = 1;
     t            = readmemw(tr.base, 0x66);