diff --git a/CMakeLists.txt b/CMakeLists.txt
index ed7dfc465..19b24a760 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -40,6 +40,7 @@ else()
 endif()
 
 if(USE_GDB_STUB)
+	add_definitions(-DUSE_GDB_STUB)
 	set(DEBUGGER_SRC "${DEBUGGER_SRC};${CMAKE_SOURCE_DIR}/src/debugger/gdb-stub.c")
 endif()
 source_group("ARM debugger" FILES ${DEBUGGER_SRC})