diff --git a/cmake/zephyr/Kconfig b/cmake/zephyr/Kconfig
index e2f7730d..f7c9c33d 100644
--- a/cmake/zephyr/Kconfig
+++ b/cmake/zephyr/Kconfig
@@ -10,6 +10,10 @@ config TOOLCHAIN_ZEPHYR_SUPPORTS_THREAD_LOCAL_STORAGE
 	def_bool y
 	select TOOLCHAIN_SUPPORTS_THREAD_LOCAL_STORAGE
 
+config TOOLCHAIN_ZEPHYR_SUPPORTS_GNU_EXTENSIONS
+	def_bool y
+	select TOOLCHAIN_SUPPORTS_GNU_EXTENSIONS
+
 config PICOLIBC_SUPPORTED
 	def_bool y
 	depends on "$(ZEPHYR_TOOLCHAIN_VARIANT)" = "zephyr"