diff --git a/intel/test_decode.c b/intel/test_decode.c
index c9ab7adc..0fcdf3b0 100644
--- a/intel/test_decode.c
+++ b/intel/test_decode.c
@@ -21,6 +21,8 @@
  * IN THE SOFTWARE.
  */
 
+#define _GNU_SOURCE
+
 #include <string.h>
 #include <stdlib.h>
 #include <stdio.h>