diff --git a/extensions/Effekseer/CMakeLists.txt b/extensions/Effekseer/CMakeLists.txt
index 6db9d03f78..ece4959228 100644
--- a/extensions/Effekseer/CMakeLists.txt
+++ b/extensions/Effekseer/CMakeLists.txt
@@ -9,11 +9,6 @@ list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 include(FilterFolder)
 
 # C++ version
-if(WIN32)
-    set(CMAKE_CXX_STANDARD 17)
-else()
-    set(CMAKE_CXX_STANDARD 14)
-endif()
 
 set(USE_INTERNAL_LOADER OFF)