diff --git a/drivers/gpu/drm/hyperv/hyperv_drm_proto.c b/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
index 051ecc526832..753d97bff76f 100644
--- a/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
+++ b/drivers/gpu/drm/hyperv/hyperv_drm_proto.c
@@ -10,7 +10,7 @@
 
 #include "hyperv_drm.h"
 
-#define VMBUS_RING_BUFSIZE (256 * 1024)
+#define VMBUS_RING_BUFSIZE VMBUS_RING_SIZE(256 * 1024)
 #define VMBUS_VSP_TIMEOUT (10 * HZ)
 
 #define SYNTHVID_VERSION(major, minor) ((minor) << 16 | (major))