diff --git a/CMakeLists.txt b/CMakeLists.txt
index 76eefe045..c8623421a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,7 +15,9 @@ set_property(DIRECTORY ${CMAKE_SOURCE_DIR} PROPERTY VS_STARTUP_PROJECT soh)
 add_compile_options($<$<CXX_COMPILER_ID:MSVC>:/MP>)
 
 if (CMAKE_SYSTEM_NAME MATCHES "Windows|Linux")
-    set(BUILD_CROWD_CONTROL ON)
+    if(NOT DEFINED BUILD_CROWD_CONTROL)
+        set(BUILD_CROWD_CONTROL ON)
+    endif()
 endif()
 
 if (CMAKE_SYSTEM_NAME STREQUAL "Windows")