diff --git a/tests/test_index.c b/tests/test_index.c
index 20d8f47b..0eb10206 100644
--- a/tests/test_index.c
+++ b/tests/test_index.c
@@ -1208,9 +1208,9 @@ test_lzma_index_cat(void)
 	assert_true(src != NULL);
 
 	assert_lzma_ret(lzma_index_append(dest, NULL,
-			UNPADDED_SIZE_MIN, LZMA_VLI_MAX - 1), LZMA_OK);
+			UNPADDED_SIZE_MIN, (LZMA_VLI_MAX / 2) + 1), LZMA_OK);
 	assert_lzma_ret(lzma_index_append(src, NULL,
-			UNPADDED_SIZE_MIN, LZMA_VLI_MAX - 1), LZMA_OK);
+			UNPADDED_SIZE_MIN, (LZMA_VLI_MAX / 2) + 1), LZMA_OK);
 	assert_lzma_ret(lzma_index_cat(dest, src, NULL), LZMA_DATA_ERROR);
 
 	lzma_index_end(dest, NULL);