Fix typo
diff --git a/src/hb-buffer.h b/src/hb-buffer.h
index abb1ea3..98f83ff 100644
--- a/src/hb-buffer.h
+++ b/src/hb-buffer.h
@@ -490,7 +490,7 @@
/* If the buffers have the same length, we compare them glyph-by-glyph
* and report which aspect(s) of the glyph info/position are different. */
HB_BUFFER_DIFF_FLAG_CODEPOINT_MISMATCH = 0x0010,
- HB_BUFFER_DIFF_FLAG_CLUSTER_MISMATCH = 0x0010,
+ HB_BUFFER_DIFF_FLAG_CLUSTER_MISMATCH = 0x0020,
HB_BUFFER_DIFF_FLAG_MASK_MISMATCH = 0x0040,
HB_BUFFER_DIFF_FLAG_POSITION_MISMATCH = 0x0080
