diff --git a/drivers/bus/isapnp/pdo.c b/drivers/bus/isapnp/pdo.c
index 87eea2d9012..4a9f28ff481 100644
--- a/drivers/bus/isapnp/pdo.c
+++ b/drivers/bus/isapnp/pdo.c
@@ -191,7 +191,7 @@ IsaPdoStartReadPort(
     IN PIO_STACK_LOCATION IrpSp)
 {
     PCM_RESOURCE_LIST ResourceList = IrpSp->Parameters.StartDevice.AllocatedResources;
-    NTSTATUS Status;
+    NTSTATUS Status = STATUS_INVALID_PARAMETER;
     KIRQL OldIrql;
     ULONG i;