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-rw-r--r--include/features.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/features.h b/include/features.h
index ab3126cdbf..96ac7e5f75 100644
--- a/include/features.h
+++ b/include/features.h
@@ -152,7 +152,8 @@
    which was used prior to the standard acceptance.  This macro will
    eventually go away and the features enabled by default once the ISO C99
    standard is widely adopted.  */
-#if defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE
+#if (defined _ISOC99_SOURCE || defined _ISOC9X_SOURCE \
+     || (defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L))
 # define __USE_ISOC99	1
 #endif