diff --git a/CMakeLists.txt b/CMakeLists.txt
index b426a7f..0f953be 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -26,7 +26,7 @@ set(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE CACHE BOOL "RPATH USE LINK PATH")
 
 #--- Declare C++ Standard -----------------------------------------------------
 set(CMAKE_CXX_STANDARD 17 CACHE STRING "")
-if(NOT CMAKE_CXX_STANDARD MATCHES "17")
+if(NOT CMAKE_CXX_STANDARD MATCHES "17|20")
   message(FATAL_ERROR "Unsupported C++ standard: ${CMAKE_CXX_STANDARD}")
 endif()
 message (STATUS "C++ standard: ${CMAKE_CXX_STANDARD}")