diff --git a/include/nuttx/arch.h b/include/nuttx/arch.h
index 18b5e911205..bf6be1ce088 100644
--- a/include/nuttx/arch.h
+++ b/include/nuttx/arch.h
@@ -511,7 +511,7 @@ EXTERN void up_udelay(useconds_t microseconds);
  *   This function should then be called in the application-specific
  *   user_start logic in order to perform the C++ initialization.  NOTE
  *   that no component of the core NuttX RTOS logic is involved; This
- *   function defintion only provides the 'contract' between application
+ *   function definition only provides the 'contract' between application
  *   specific C++ code and platform-specific toolchain support
  *
  ***************************************************************************/