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-rw-r--r--include/wctype.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/wctype.h b/include/wctype.h
index 676c04358b..b29e82484b 100644
--- a/include/wctype.h
+++ b/include/wctype.h
@@ -80,7 +80,7 @@ libc_hidden_proto (__towupper_l)
 
 /* The spec says that isdigit must only match the decimal digits.  We
    can check this without a memory access.  */
-# ifndef NOT_IN_libc
+# if IS_IN (libc)
 #  undef iswdigit
 #  define iswdigit(c) ({ wint_t __c = (c); __c >= L'0' && __c <= L'9'; })
 #  undef iswdigit_l