diff --git a/radio/src/CMakeLists.txt b/radio/src/CMakeLists.txt
index dc8a09207..68892ea18 100644
--- a/radio/src/CMakeLists.txt
+++ b/radio/src/CMakeLists.txt
@@ -293,15 +293,16 @@ endif()
 if(DEBUG STREQUAL RTT)
   set(DEBUG ON)
   set(DEBUG_SEGGER_RTT ON)
-  add_definitions(-DDEBUG_SEGGER_RTT)
-  set(SRC ${SRC} ${THIRDPARTY_DIR}/Segger_RTT/RTT/SEGGER_RTT.c)
 endif()
 
 if(DEBUG STREQUAL RTT_NO_USB)
   set(DEBUG ON)
   set(DEBUG_SEGGER_RTT ON)
-  add_definitions(-DDEBUG_SEGGER_RTT)
   add_definitions(-DDEBUG_DISABLE_USB)
+endif()
+
+if(DEBUG_SEGGER_RTT)
+  add_definitions(-DDEBUG_SEGGER_RTT -DSEGGER_RTT_BUFFER_SECTION=".ram")
   set(SRC ${SRC} ${THIRDPARTY_DIR}/Segger_RTT/RTT/SEGGER_RTT.c)
 endif()