diff --git a/skeletons/INTEGER.c b/skeletons/INTEGER.c
index a839b32b..eed82176 100644
--- a/skeletons/INTEGER.c
+++ b/skeletons/INTEGER.c
@@ -3,10 +3,6 @@
  * All rights reserved.
  * Redistribution and modifications are permitted subject to BSD license.
  */
-#ifndef _BSD_SOURCE
-#define _BSD_SOURCE /* for snprintf() on some linux systems  */
-#endif
-#include <stdio.h>
 #include <asn_internal.h>
 #include <INTEGER.h>
 #include <asn_codecs_prim.h>	/* Encoder and decoder of a primitive type */
diff --git a/skeletons/asn_system.h b/skeletons/asn_system.h
index 24d8da79..d19837ed 100644
--- a/skeletons/asn_system.h
+++ b/skeletons/asn_system.h
@@ -13,6 +13,10 @@
 #include "config.h"
 #endif
 
+#ifndef _BSD_SOURCE
+#define _BSD_SOURCE /* for snprintf() on some linux systems  */
+#endif
+
 #include <stdio.h>	/* For snprintf(3) */
 #include <stdlib.h>	/* For *alloc(3) */
 #include <string.h>	/* For memcpy(3) */