diff --git a/cmake/compiler/arcmwdt/compiler_flags.cmake b/cmake/compiler/arcmwdt/compiler_flags.cmake
index 5383016795..5d2be413dc 100644
--- a/cmake/compiler/arcmwdt/compiler_flags.cmake
+++ b/cmake/compiler/arcmwdt/compiler_flags.cmake
@@ -1,5 +1,3 @@
-set_property(GLOBAL PROPERTY CSTD gnu99)
-
 # List the warnings that are not supported for C++ compilations
 list(APPEND CXX_EXCLUDED_OPTIONS
   -Werror=implicit-int
diff --git a/cmake/toolchain/arcmwdt/Kconfig b/cmake/toolchain/arcmwdt/Kconfig
index c2ef35d3c7..3f70536b36 100644
--- a/cmake/toolchain/arcmwdt/Kconfig
+++ b/cmake/toolchain/arcmwdt/Kconfig
@@ -4,3 +4,7 @@
 config TOOLCHAIN_ARCMWDT_SUPPORTS_THREAD_LOCAL_STORAGE
 	def_bool y
 	select TOOLCHAIN_SUPPORTS_THREAD_LOCAL_STORAGE
+
+config TOOLCHAIN_ARCMWDT_SUPPORTS_GNU_EXTENSIONS
+	def_bool y
+	select TOOLCHAIN_SUPPORTS_GNU_EXTENSIONS