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-rw-r--r--posix/regex.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/posix/regex.h b/posix/regex.h
index 0efef36..2bca537 100644
--- a/posix/regex.h
+++ b/posix/regex.h
@@ -282,7 +282,7 @@ extern reg_syntax_t re_syntax_options;
`re_error_msg' table in regex.c. */
typedef enum
{
-#if (_XOPEN_SOURCE - 0) == 500
+#ifdef _XOPEN_SOURCE
REG_ENOSYS = -1, /* This will never happen for this implementation. */
#endif