diff --git a/package/boot/uboot-envtools/patches/100-fw_env_gnu_source.patch b/package/boot/uboot-envtools/patches/100-fw_env_gnu_source.patch
new file mode 100644
index 0000000000..eeed1d637c
--- /dev/null
+++ b/package/boot/uboot-envtools/patches/100-fw_env_gnu_source.patch
@@ -0,0 +1,10 @@
+--- a/tools/env/fw_env.c
++++ b/tools/env/fw_env.c
+@@ -8,6 +8,7 @@
+  * SPDX-License-Identifier:	GPL-2.0+
+  */
+ 
++#define _GNU_SOURCE
+ #include <errno.h>
+ #include <env_flags.h>
+ #include <fcntl.h>