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-rw-r--r--src/reader.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/reader.c b/src/reader.c
index 3e859765..e49c2a10 100644
--- a/src/reader.c
+++ b/src/reader.c
@@ -761,7 +761,7 @@ read_LANGTAG(SerdReader* reader)
}
Ref ref = push_node(reader, SERD_LITERAL, "", 0);
push_byte(reader, ref, eat_byte_safe(reader, c));
- while ((c = peek_byte(reader)) && in_range(c, 'a', 'z')) {
+ while ((c = peek_byte(reader)) && is_alpha(c)) {
push_byte(reader, ref, eat_byte_safe(reader, c));
}
while (peek_byte(reader) == '-') {