diff --git a/workspace_tools/toolchains/__init__.py b/workspace_tools/toolchains/__init__.py
index 5e25e87d40..daaa09c617 100644
--- a/workspace_tools/toolchains/__init__.py
+++ b/workspace_tools/toolchains/__init__.py
@@ -198,6 +198,7 @@ class mbedToolchain:
         "Cortex-M0+": ["__CORTEX_M0PLUS", "ARM_MATH_CM0PLUS"],
         "Cortex-M4" : ["__CORTEX_M4", "ARM_MATH_CM4"],
         "Cortex-M4F" : ["__CORTEX_M4", "ARM_MATH_CM4", "__FPU_PRESENT=1"],
+        "Cortex-A9" : ["__CORTEX_A9", "ARM_MATH_CA9", "__FPU_PRESENT", "__CMSIS_RTOS", "__EVAL", "__MBED_CMSIS_RTOS_CA9"],
     }
 
     GOANNA_FORMAT = "[Goanna] warning [%FILENAME%:%LINENO%] - [%CHECKNAME%(%SEVERITY%)] %MESSAGE%"