diff --git a/sdk/include/ddk/classpnp.h b/sdk/include/ddk/classpnp.h
index e8fda74498f..65cd35fe81f 100644
--- a/sdk/include/ddk/classpnp.h
+++ b/sdk/include/ddk/classpnp.h
@@ -1432,7 +1432,7 @@ ClassSendNotification(
 
 #endif /* (NTDDI_VERSION >= NTDDI_VISTA) */
 
-__inline
+FORCEINLINE
 UCHAR
 GET_FDO_EXTENSON_SENSE_DATA_LENGTH (
   _In_ PFUNCTIONAL_DEVICE_EXTENSION FdoExtension)