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-rw-r--r--include/stdlib.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/stdlib.h b/include/stdlib.h
index b8efbd7b3a..992b87793c 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -226,7 +226,7 @@ extern int __qfcvt_r (long double __value, int __ndigit,
 		      int *__restrict __decpt, int *__restrict __sign,
 		      char *__restrict __buf, size_t __len);
 
-# ifndef NOT_IN_libc
+# if IS_IN (libc)
 #  undef MB_CUR_MAX
 #  define MB_CUR_MAX (_NL_CURRENT_WORD (LC_CTYPE, _NL_CTYPE_MB_CUR_MAX))
 # endif