diff --git a/reactos/drivers/wdm/audio/backpln/portcls/portcls.rbuild b/reactos/drivers/wdm/audio/backpln/portcls/portcls.rbuild
index 76bcc0dad4f..9e869ac058e 100644
--- a/reactos/drivers/wdm/audio/backpln/portcls/portcls.rbuild
+++ b/reactos/drivers/wdm/audio/backpln/portcls/portcls.rbuild
@@ -11,6 +11,7 @@
     <define name="__USE_W32API" />
     <define name="_NTDDK_" />
     <define name="DBG" />
+    <define name="PC_NO_IMPORTS" />
 
     <include base="portcls">../include</include>