diff --git a/radio/src/CMakeLists.txt b/radio/src/CMakeLists.txt
index 76e6de143..0b376f2ab 100644
--- a/radio/src/CMakeLists.txt
+++ b/radio/src/CMakeLists.txt
@@ -121,10 +121,6 @@ add_definitions(
 )
 
 set(HW_DESC_JSON ${FLAVOUR}.json)
-AddHardwareDefTarget(${HW_DESC_JSON})
-
-# enable generating JSON definition separately for debugging
-add_custom_target(hardware_defs DEPENDS ${HW_DESC_JSON}.h)
 
 include(hal/CMakeLists.txt)
 
@@ -152,6 +148,11 @@ if(ARCH STREQUAL ARM)
   include(targets/common/arm/CMakeLists.txt)
 endif()
 
+# Generate hardware definitions from hal.h
+# Must be after all add_definitions() so the preprocessor sees all flags
+AddHardwareDefTarget(${HW_DESC_JSON})
+add_custom_target(hardware_defs DEPENDS ${HW_DESC_JSON}.h)
+
 include_directories(targets/${TARGET_DIR} ${THIRDPARTY_DIR})
 
 if(NATIVE_BUILD)