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-rw-r--r--ext/syck/rubyext.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/syck/rubyext.c b/ext/syck/rubyext.c
index 2ab2e49482..92b413dc54 100644
--- a/ext/syck/rubyext.c
+++ b/ext/syck/rubyext.c
@@ -277,7 +277,7 @@ mktime_do(VALUE varg)
const char *end = ptr + 1;
const char *begin = end;
ptrdiff_t length;
- while ( isdigit( *end ) ) end++;
+ while ( ISDIGIT( *end ) ) end++;
if ((length = (end - begin)) > padding) length = padding;
MEMCPY(padded, begin, char, length);
usec = strtol(padded, NULL, 10);