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-rw-r--r--erts/lib_src/common/erl_printf.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/erts/lib_src/common/erl_printf.c b/erts/lib_src/common/erl_printf.c
index 259ba8c81d..86f5da1c40 100644
--- a/erts/lib_src/common/erl_printf.c
+++ b/erts/lib_src/common/erl_printf.c
@@ -27,6 +27,11 @@
#include "config.h"
#endif
+#if defined(__sun) || defined(__sun__)
+ /* For flockfile(3c), putc_unlocked(3c), etc */
+ #define __EXTENSIONS__
+#endif
+
#include <string.h>
#include "erl_errno.h"
#ifdef __WIN32__