diff --git a/tools/firmware-utils/src/zyimage.c b/tools/firmware-utils/src/zyimage.c
index 6aacf2ff1b..4f7cfd6f43 100644
--- a/tools/firmware-utils/src/zyimage.c
+++ b/tools/firmware-utils/src/zyimage.c
@@ -7,8 +7,6 @@
  *
  */
 
-#define _POSIX_SOURCE
-#define _POSIX_C_SOURCE 199309L /* getopt */
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/types.h>