diff --git a/CMakeLists.txt b/CMakeLists.txt
index cffa32ce..399aecb2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,7 @@ set(CC_EXTERNAL_PRIVATE_INCLUDES)
 set(CC_EXTERNAL_PRIVATE_DEFINITIONS)
 
 list(APPEND CC_EXTERNAL_PRIVATE_DEFINITIONS
-    TBB_USE_EXCEPTIONS=0 # no rtti for now
+    TBB_USE_EXCEPTIONS = 0 # no rtti for now
 )
 
 include(${CMAKE_CURRENT_LIST_DIR}/cmake/CocosExternalConfig.cmake)