diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index 366080b..7f19c8b 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -667,7 +667,13 @@
 {
 	struct se_device *dev = SE_DEV(cmd);
 	unsigned char *buf = cmd->t_task->t_task_buf;
-	u32 blocks = dev->transport->get_blocks(dev);
+	unsigned long long blocks_long = dev->transport->get_blocks(dev);
+	u32 blocks;
+
+	if (blocks_long >= 0x00000000ffffffff)
+		blocks = 0xffffffff;
+	else
+		blocks = (u32)blocks_long;
 
 	buf[0] = (blocks >> 24) & 0xff;
 	buf[1] = (blocks >> 16) & 0xff;