diff --git a/reactos/drivers/bus/isapnp/hardware.c b/reactos/drivers/bus/isapnp/hardware.c
index 67a903948f8..99e5d44aa33 100644
--- a/reactos/drivers/bus/isapnp/hardware.c
+++ b/reactos/drivers/bus/isapnp/hardware.c
@@ -352,7 +352,7 @@ TryIsolate(PUCHAR ReadDataPort)
         HwDelay();
         Data = ((Data << 8) | ReadData(ReadDataPort));
         HwDelay();
-        Data >>= 1;
+        Byte >>= 1;
 
         if (Data != 0xFFFF)
         {