diff --git a/fmacros.h b/fmacros.h
index 9e5fec0..19d7b21 100644
--- a/fmacros.h
+++ b/fmacros.h
@@ -1,8 +1,9 @@
 #ifndef __HIREDIS_FMACRO_H
 #define __HIREDIS_FMACRO_H
 
-#if !defined(_BSD_SOURCE)
+#if defined(__linux__)
 #define _BSD_SOURCE
+#define _DEFAULT_SOURCE
 #endif
 
 #if defined(__sun__)