diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 11d14e4..fde4b7b 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -137,6 +137,11 @@ set_target_properties(
       1.1
 )
 
+if(USE_SYSTEM_RAPIDJSON)
+  find_package(RapidJSON CONFIG REQUIRED)
+  target_link_libraries(libopencc PRIVATE rapidjson)
+endif()
+
 # Installation
 
 install(