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-rw-r--r--wcsmbs/wchar.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/wcsmbs/wchar.h b/wcsmbs/wchar.h
index 2292bd84b6..3b15d9f38a 100644
--- a/wcsmbs/wchar.h
+++ b/wcsmbs/wchar.h
@@ -192,7 +192,7 @@ extern int wcswidth __P ((__const wchar_t *__s, size_t __n));
    representation.  */
 extern double wcstod __P ((__const wchar_t *__nptr, wchar_t **__endptr));
 
-#ifdef USE_GNU
+#ifdef __USE_GNU
 /* Likewise for `float' and `long double' sizes of floating-point numbers.  */
 extern float wcstof __P ((__const wchar_t *__nptr, wchar_t **__endptr));
 extern __long_double_t wcstold __P ((__const wchar_t *__nptr,