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-rw-r--r--include/features.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/features.h b/include/features.h
index 137a90b405..d22c32eee6 100644
--- a/include/features.h
+++ b/include/features.h
@@ -214,7 +214,7 @@
    define _DEFAULT_SOURCE.  */
 #if (defined _DEFAULT_SOURCE					\
      || (!defined __STRICT_ANSI__				\
-	 && !defined _ISOC99_SOURCE				\
+	 && !defined _ISOC99_SOURCE && !defined _ISOC11_SOURCE	\
 	 && !defined _POSIX_SOURCE && !defined _POSIX_C_SOURCE	\
 	 && !defined _XOPEN_SOURCE))
 # undef  _DEFAULT_SOURCE