--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1024,8 +1024,8 @@
   # https://stackoverflow.com/q/61250087
   add_definitions("${CMAKE_CPP_FLAGS}" "${CMAKE_CXX_FLAGS}" "${CRYPTOPP_COMPILE_DEFINITIONS}" "${CRYPTOPP_COMPILE_OPTIONS}")
 else()
-  add_compile_definitions("${CMAKE_CPP_FLAGS}" "${CRYPTOPP_COMPILE_DEFINITIONS}")
-  add_compile_options("${CMAKE_CXX_FLAGS}" "${CRYPTOPP_COMPILE_OPTIONS}")
+  add_compile_definitions(${CRYPTOPP_COMPILE_DEFINITIONS})
+  add_compile_options(${CRYPTOPP_COMPILE_OPTIONS})
 endif()
 
 #============================================================================