diff --git a/sys/i386/pci/pci_cfgreg.c b/sys/i386/pci/pci_cfgreg.c
index 91746fe5db9d..0e3b8c3ff15d 100644
--- a/sys/i386/pci/pci_cfgreg.c
+++ b/sys/i386/pci/pci_cfgreg.c
@@ -732,7 +732,7 @@ pcireg_cfgopen(void)
 		devmax = 32;
 
 		outl(CONF1_ADDR_PORT, CONF1_ENABLE_CHK);
-		outb(CONF1_ADDR_PORT + 3, 0);
+		DELAY(1);
 		mode1res = inl(CONF1_ADDR_PORT);
 		outl(CONF1_ADDR_PORT, oldval1);
 
diff --git a/sys/i386/pci/pci_pir.c b/sys/i386/pci/pci_pir.c
index 91746fe5db9d..0e3b8c3ff15d 100644
--- a/sys/i386/pci/pci_pir.c
+++ b/sys/i386/pci/pci_pir.c
@@ -732,7 +732,7 @@ pcireg_cfgopen(void)
 		devmax = 32;
 
 		outl(CONF1_ADDR_PORT, CONF1_ENABLE_CHK);
-		outb(CONF1_ADDR_PORT + 3, 0);
+		DELAY(1);
 		mode1res = inl(CONF1_ADDR_PORT);
 		outl(CONF1_ADDR_PORT, oldval1);