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-rw-r--r--include/features.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/features.h b/include/features.h
index a696d8b59c..f7edc14aed 100644
--- a/include/features.h
+++ b/include/features.h
@@ -230,6 +230,8 @@
 
 #if (_POSIX_C_SOURCE - 0) >= 200112L
 # define __USE_XOPEN2K		1
+# undef __USE_ISOC99
+# define __USE_ISOC99		1
 #endif
 
 #if (_POSIX_C_SOURCE - 0) >= 200809L