diff --git a/includes.h b/includes.h
index 2789f23..884ebf7 100644
--- a/includes.h
+++ b/includes.h
@@ -25,6 +25,8 @@
 #ifndef DROPBEAR_INCLUDES_H_
 #define DROPBEAR_INCLUDES_H_
 
+/* uclibc needs _GNU_SOURCE, maybe other things? */
+#define _GNU_SOURCE
 
 #include "options.h"
 #include "debug.h"
@@ -125,8 +127,6 @@
 #endif
 
 #ifdef HAVE_SYS_RANDOM_H
-/* uclibc needs _GNU_SOURCE */
-#define _GNU_SOURCE
 #include <sys/random.h>
 #endif