diff --git a/reactos/drivers/net/dd/pcnet/pcnet.c b/reactos/drivers/net/dd/pcnet/pcnet.c
index 71746583701..8e4289d0469 100644
--- a/reactos/drivers/net/dd/pcnet/pcnet.c
+++ b/reactos/drivers/net/dd/pcnet/pcnet.c
@@ -35,7 +35,7 @@
 #include "pcnethw.h"
 #include "pcnet.h"
 
-#define USE_IMMEDIATE_PORT_IO 1
+#define USE_IMMEDIATE_PORT_IO 0
 
 VOID
 STDCALL