diff --git a/reactos/drivers/dd/serial/pnp.c b/reactos/drivers/dd/serial/pnp.c
index 990f8e0a8ee..8658eb731ce 100644
--- a/reactos/drivers/dd/serial/pnp.c
+++ b/reactos/drivers/dd/serial/pnp.c
@@ -138,7 +138,7 @@ SerialPnpStartDevice(
 	ULONG Vector = 0;
 	ULONG i, j;
 	KIRQL Dirql;
-	KAFFINITY Affinity;
+	KAFFINITY Affinity = 0;
 	KINTERRUPT_MODE InterruptMode = Latched;
 	BOOLEAN ShareInterrupt = TRUE;
 	OBJECT_ATTRIBUTES objectAttributes;