diff --git a/CMakeLists.txt b/CMakeLists.txt
index fd01def3..9804337b 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -99,6 +99,7 @@ if (WITH_DLT)
 	add_definitions("-DWITH_DLT")
 endif (WITH_DLT)
 
+option(WITH_CJSON "Build with cJSON support (required for dynamic security plugin and useful for mosquitto_sub)?" ON)
 if (WITH_CJSON)
     FIND_PACKAGE(cJSON)
     if (CJSON_FOUND)