diff --git a/includes.h b/includes.h
index e8c3e18..2789f23 100644
--- a/includes.h
+++ b/includes.h
@@ -125,6 +125,8 @@
 #endif
 
 #ifdef HAVE_SYS_RANDOM_H
+/* uclibc needs _GNU_SOURCE */
+#define _GNU_SOURCE
 #include <sys/random.h>
 #endif