diff --git a/system/microros/micro_ros_lib/toolchain.cmake.in b/system/microros/micro_ros_lib/toolchain.cmake.in
index 8d3aabe3c..ebfa15eea 100644
--- a/system/microros/micro_ros_lib/toolchain.cmake.in
+++ b/system/microros/micro_ros_lib/toolchain.cmake.in
@@ -9,8 +9,8 @@ set(PLATFORM_NAME "nuttx")
 set(CMAKE_C_COMPILER @CMAKE_C_COMPILER@)
 set(CMAKE_CXX_COMPILER @CMAKE_CXX_COMPILER@)
 
-set(CMAKE_C_FLAGS_INIT "-std=c11 @ARCH_C_FLAGS@ -D__NuttX__ -D'__attribute__(x)='" CACHE STRING "" FORCE)
-set(CMAKE_CXX_FLAGS_INIT "-std=c++14 @ARCH_CPP_FLAGS@ -fno-rtti -D__NuttX__ -D'__attribute__(x)='" CACHE STRING "" FORCE)
+set(CMAKE_C_FLAGS_INIT "-std=c11 @ARCH_C_FLAGS@ -D__NuttX__" CACHE STRING "" FORCE)
+set(CMAKE_CXX_FLAGS_INIT "-std=c++14 @ARCH_CPP_FLAGS@ -fno-rtti -D__NuttX__" CACHE STRING "" FORCE)
 
 set(NUTTX_TOPDIR @NUTTX_TOPDIR@)
 set(NUTTX_APPDIR @NUTTX_APPDIR@)