diff --git a/CMakeLists.txt b/CMakeLists.txt
index a25bd87..a345ae9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,7 +15,7 @@ if(${TIM_VX_CODE_COVERAGE})
 endif()
 
 
-if(NOT DEFINED CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
   set(CMAKE_INSTALL_PREFIX "${CMAKE_BINARY_DIR}/install" CACHE PATH "..." FORCE)
 endif()