diff --git a/crypto/dso/dso_dlfcn.c b/crypto/dso/dso_dlfcn.c
index 4a56aace0e..faa9d76b42 100644
--- a/crypto/dso/dso_dlfcn.c
+++ b/crypto/dso/dso_dlfcn.c
@@ -60,10 +60,8 @@
    that handle _GNU_SOURCE and other similar macros.  Defining it later
    is simply too late, because those headers are protected from re-
    inclusion.  */
-#ifdef __linux
-# ifndef _GNU_SOURCE
-#  define _GNU_SOURCE	/* make sure dladdr is declared */
-# endif
+#ifndef _GNU_SOURCE
+# define _GNU_SOURCE	/* make sure dladdr is declared */
 #endif
 
 #include <stdio.h>