diff --git a/src/hlua.c b/src/hlua.c
index 1829e87..550b592 100644
--- a/src/hlua.c
+++ b/src/hlua.c
@@ -10,6 +10,8 @@
  *
  */
 
+#define _GNU_SOURCE
+
 #include <ctype.h>
 #include <setjmp.h>