diff --git a/scripts/fix_size.c b/scripts/fix_size.c
index c7dcd5f..7014a3f 100644
--- a/scripts/fix_size.c
+++ b/scripts/fix_size.c
@@ -1,3 +1,6 @@
+#define _BSD_SOURCE             /* See feature_test_macros(7) */
+#define _DEFAULT_SOURCE
+
 #include <stdlib.h>
 #include <stdio.h>
 #include <sys/types.h>
@@ -6,9 +9,6 @@
 #include <unistd.h>
 #include <stdint.h>
 #include <fcntl.h>
-#ifndef _BSD_SOURCE
-#define _BSD_SOURCE             /* See feature_test_macros(7) */
-#endif
 #include <endian.h>
 
 int main(int argc, char**argv)
diff --git a/scripts/mk-omap-image.c b/scripts/mk-omap-image.c
index d0335ad..1d61a34 100644
--- a/scripts/mk-omap-image.c
+++ b/scripts/mk-omap-image.c
@@ -34,6 +34,7 @@
  */
 
 #define _BSD_SOURCE
+#define _DEFAULT_SOURCE
 
 #include <stdio.h>
 #include <sys/types.h>
diff --git a/scripts/mkublheader.c b/scripts/mkublheader.c
index b61630a..5464a80 100644
--- a/scripts/mkublheader.c
+++ b/scripts/mkublheader.c
@@ -19,6 +19,7 @@
  */
 
 #define _BSD_SOURCE
+#define _DEFAULT_SOURCE
 
 #include <stdio.h>
 #include <sys/types.h>