diff --git a/system/microros/micro_ros_lib/toolchain.cmake.in b/system/microros/micro_ros_lib/toolchain.cmake.in
index dbdc290e2..8d3aabe3c 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'__attribute__(x)='" CACHE STRING "" FORCE)
-set(CMAKE_CXX_FLAGS_INIT "-std=c++14 @ARCH_CPP_FLAGS@ -fno-rtti -D'__attribute__(x)='" CACHE STRING "" FORCE)
+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(NUTTX_TOPDIR @NUTTX_TOPDIR@)
 set(NUTTX_APPDIR @NUTTX_APPDIR@)
diff --git a/system/microros/patches/0002-rcutils-process-nuttx-compat.patch b/system/microros/patches/0002-rcutils-process-nuttx-compat.patch
new file mode 100644
index 000000000..ca8b6c56a
--- /dev/null
+++ b/system/microros/patches/0002-rcutils-process-nuttx-compat.patch
@@ -0,0 +1,20 @@
+From: micro-ROS NuttX Port <noreply@nuttx.apache.org>
+Subject: [PATCH] rcutils: skip program_invocation_name on NuttX
+
+When cross-compiling for NuttX on a Linux host the compiler still
+defines __linux__, causing rcutils_get_executable_name() to reference
+program_invocation_name which is a glibc extension absent from the
+NuttX C library.  Guard the Linux branch with !defined(__NuttX__) so
+the "embedded OS" fallback (empty string) is taken instead.
+
+--- a/rcutils/src/process.c
++++ b/rcutils/src/process.c
+@@ -61,7 +61,7 @@ int rcutils_get_pid()
+ #if defined __APPLE__ || defined __FreeBSD__ || (defined __ANDROID__ && __ANDROID_API__ >= 21)
+   const char * appname = getprogname();
+ #elif defined __GNUC__ && !defined(__QNXNTO__) && !defined(__OHOS__)
+-  #if defined __linux__ || defined __linux || defined __gnu_linux__ || defined linux
++  #if (defined __linux__ || defined __linux || defined __gnu_linux__ || defined linux) && !defined(__NuttX__)
+     const char * appname = program_invocation_name;
+   #else
+     // Some embedded OS compile with __GNUC__ but are not quite conformant with GNU-specific extensions.