diff --git a/src/random_r.c b/src/random_r.c
index 51ce113..bffce85 100644
--- a/src/random_r.c
+++ b/src/random_r.c
@@ -28,11 +28,17 @@
 #include <unistd.h>
 /* #include <errno.h> */
 
-#ifdef __MACH__
-# include "../include/features.h"
-#else
-# include <features.h>
-#endif /* __MACH__ */
+#if defined(__unix__) || (defined(__APPLE__) && defined(__MACH__))
+# include <sys/param.h>
+# if defined(__APPLE__) && defined(__MACH__)
+#  include "../include/features.h"
+# elif(BSD)
+/* BSD (DragonFly BSD, FreeBSD, OpenBSD, NetBSD)
+   Nothing to include */
+# else
+#  include <features.h>
+# endif
+#endif
 
 #include "random_r.h"