diff --git a/tests/col1block.h b/tests/col1block.h
index 1b79a2dce..9346e4055 100644
--- a/tests/col1block.h
+++ b/tests/col1block.h
@@ -500,5 +500,5 @@ unsigned char __col1block_cdf[] = {
     0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0,
     0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff};
 unsigned int __col1block_cdf_len = 8192;
-constexpr int __col1block_cdf_umin = -126;
+constexpr int __col1block_cdf_umin = -128;
 constexpr int __col1block_cdf_umax = 127;