diff --git a/CMakeLists.txt b/CMakeLists.txt
index 950d115..8d69855 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -52,7 +52,7 @@ if(CCACHE_FOUND)
 endif(CCACHE_FOUND)
 
 if ("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
-    if(${RAPIDJSON_DISABLE_INSTRUMENTATION_OPT}) 
+    if(${RAPIDJSON_ENABLE_INSTRUMENTATION_OPT})
         if("${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "powerpc" OR "${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "ppc64" OR "${CMAKE_SYSTEM_PROCESSOR}" STREQUAL "ppc64le")
           set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mcpu=native")
         else()