diff --git a/Modules/Compiler/IBMClang-CXX.cmake b/Modules/Compiler/IBMClang-CXX.cmake
index 5431b17e20..be9b5257b8 100644
--- a/Modules/Compiler/IBMClang-CXX.cmake
+++ b/Modules/Compiler/IBMClang-CXX.cmake
@@ -31,6 +31,8 @@ if (CMAKE_CXX_COMPILER_VERSION VERSION_GREATER_EQUAL 17.1.0)
   set(CMAKE_CXX17_EXTENSION_COMPILE_OPTION "-std=gnu++17")
   set(CMAKE_CXX20_STANDARD_COMPILE_OPTION  "-std=c++20")
   set(CMAKE_CXX20_EXTENSION_COMPILE_OPTION "-std=gnu++20")
+  set(CMAKE_CXX23_STANDARD_COMPILE_OPTION  "-std=c++2b")
+  set(CMAKE_CXX23_EXTENSION_COMPILE_OPTION "-std=gnu++2b")
 endif()
 
 __compiler_check_default_language_standard(CXX 17.1.0 17)