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-rw-r--r--src/os_win/os_path.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/os_win/os_path.c b/src/os_win/os_path.c
index e9532de2b38..220752ce7a1 100644
--- a/src/os_win/os_path.c
+++ b/src/os_win/os_path.c
@@ -19,7 +19,7 @@ __wt_absolute_path(const char *path)
* Check for a drive name (for example, "D:"), allow both forward and
* backward slashes.
*/
- if (strlen(path) >= 3 && isalpha(path[0]) && path[1] == ':')
+ if (strlen(path) >= 3 && __wt_isalpha(path[0]) && path[1] == ':')
path += 2;
return (path[0] == '/' || path[0] == '\\');
}