diff --git a/viostor/virtio_stor.h b/viostor/virtio_stor.h
index 7ea614cad..a9e08f383 100644
--- a/viostor/virtio_stor.h
+++ b/viostor/virtio_stor.h
@@ -88,7 +88,7 @@ typedef struct VirtIOBufferDescriptor VIO_SG, *PVIO_SG;
 
 #define BLOCK_SERIAL_STRLEN                20
 
-#define MAX_PHYS_SEGMENTS                  512
+#define MAX_PHYS_SEGMENTS                  1024
 #define VIRTIO_MAX_SG                      (3 + MAX_PHYS_SEGMENTS)
 
 #define VIOBLK_POOL_TAG                    'BoiV'