diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2f694241..54761836 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,7 +30,9 @@ endif()
 # Compiler config
 # ---------------------------------------------------------------------------------------
 if(SPDLOG_USE_STD_FORMAT)
+if(NOT DEFINED CMAKE_CXX_STANDARD)
     set(CMAKE_CXX_STANDARD 20)
+endif()
     set(CMAKE_CXX_STANDARD_REQUIRED ON)
 elseif(NOT CMAKE_CXX_STANDARD)
     set(CMAKE_CXX_STANDARD 11)