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-rw-r--r--mrbgems/mruby-io/src/file.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mrbgems/mruby-io/src/file.c b/mrbgems/mruby-io/src/file.c
index ffce0ddcb..3f3b6bb25 100644
--- a/mrbgems/mruby-io/src/file.c
+++ b/mrbgems/mruby-io/src/file.c
@@ -284,7 +284,7 @@ mrb_file_is_absolute_path(const char *path)
{
#ifdef _WIN32
#define IS_PATHSEP(x) (x == '/' || x == '\\')
- if (isalpha(path[0]))
+ if (ISALPHA(path[0]))
return (strlen(path) > 2 && path[1] == ':' && IS_PATHSEP(path[2]));
else
return (IS_PATHSEP(path[0]) && IS_PATHSEP(path[1]));