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-rw-r--r--utf8.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/utf8.h b/utf8.h
index 8d12f8dba2..be14a94bb3 100644
--- a/utf8.h
+++ b/utf8.h
@@ -183,7 +183,7 @@ Perl's extended UTF-8 means we can have start bytes up to FF.
* bytes from an ordinal that is known to fit into two bytes; it must be less
* than 0x3FF to work across both encodings. */
/* Nocast allows these to be used in the case label of a switch statement */
-#define UTF8_TWO_BYTE_HI_nocast(c) UTF_TO_NATIVE(((c) >> UTF_ACCUMULATION_SHIFT) | UTF_START_MARK(2))
+#define UTF8_TWO_BYTE_HI_nocast(c) UTF_TO_NATIVE(((c) >> UTF_ACCUMULATION_SHIFT) | (0xFF & UTF_START_MARK(2)))
#define UTF8_TWO_BYTE_LO_nocast(c) UTF_TO_NATIVE(((c) & UTF_CONTINUATION_MASK) | UTF_CONTINUATION_MARK)
#define UTF8_TWO_BYTE_HI(c) ((U8) (UTF8_TWO_BYTE_HI_nocast(c)))