diff --git a/Documentation/guides/cpp_cmake.rst b/Documentation/guides/cpp_cmake.rst
index 498f5ed0b5..00c45bb21e 100644
--- a/Documentation/guides/cpp_cmake.rst
+++ b/Documentation/guides/cpp_cmake.rst
@@ -147,7 +147,7 @@ Creating the project
 
     set(AC_HW_FLAGS         "-mcpu=cortex-m4 -mthumb -mfloat-abi=soft ")
     set(AC_HW_FLAGS         "${AC_HW_FLAGS} -isystem ${NUTTX_PATH}/include")
-    set(AC_HW_FLAGS         "${AC_HW_FLAGS} -pipe -D__NuttX__")
+    set(AC_HW_FLAGS         "${AC_HW_FLAGS} -pipe")
 
     set(AC_LINKER_FLAGS     "--entry=__start -nostartfiles -nodefaultlibs -T${MCU_LINKER_SCRIPT}")
 
diff --git a/boards/risc-v/bl602/bl602evb/scripts/Make.defs b/boards/risc-v/bl602/bl602evb/scripts/Make.defs
index 0ab4838258..76943d4ea7 100644
--- a/boards/risc-v/bl602/bl602evb/scripts/Make.defs
+++ b/boards/risc-v/bl602/bl602evb/scripts/Make.defs
@@ -46,7 +46,7 @@ endif
 
 ARCHCPUFLAGS += -mno-relax
 ARCHCFLAGS = -fno-common -fno-builtin -ffunction-sections -fdata-sections
-ARCHCXXFLAGS = -fno-common -fno-builtin -ffunction-sections -fdata-sections -fno-exceptions -fcheck-new -std=c++17 -D__NuttX__ -pipe -nostdinc++
+ARCHCXXFLAGS = -fno-common -fno-builtin -ffunction-sections -fdata-sections -fno-exceptions -fcheck-new -std=c++17 -pipe -nostdinc++
 ARCHWARNINGS = -Wall -Wstrict-prototypes -Wshadow -Wundef
 ARCHWARNINGSXX = -Wall -Wshadow -Wundef
 ARCHPICFLAGS = -fpic -msingle-pic-base -mpic-register=r10