diff --git a/test-tool/test_read6_simple.c b/test-tool/test_read6_simple.c
index 1799aaf..617f4ac 100644
--- a/test-tool/test_read6_simple.c
+++ b/test-tool/test_read6_simple.c
@@ -46,6 +46,11 @@ test_read6_simple(void)
 
 
 	logging(LOG_VERBOSE, "Test READ6 of 1-255 blocks at the end of the LUN");
+	if (num_blocks >= 0x1fffff) {
+		CU_PASS("LUN is too big for read-at-eol tests with READ6. Skipping test.\n");
+		return;
+	}
+
 	for (i = 1; i <= 255; i++) {
 		ret = read6(iscsic, tgt_lun, num_blocks - i,
 			    i * block_size, block_size, NULL);