diff --git a/cmake/ConfigureChecks.cmake b/cmake/ConfigureChecks.cmake
index 5f09ee1b5..be696da71 100644
--- a/cmake/ConfigureChecks.cmake
+++ b/cmake/ConfigureChecks.cmake
@@ -183,7 +183,7 @@ CMAKE_POP_CHECK_STATE()
 # standards flag.
 # Also see https://github.com/fish-shell/fish-shell/issues/5865
 IF(NOT POLICY CMP0067)
-  LIST(APPEND CMAKE_REQUIRED_FLAGS "${CMAKE_CXX${CMAKE_CXX_EXTENSION}_STANDARD_COMPILE_OPTION}")
+  LIST(APPEND CMAKE_REQUIRED_FLAGS "${CMAKE_CXX${CMAKE_CXX_STANDARD}_EXTENSION_COMPILE_OPTION}")
 ENDIF()
 
 CHECK_CXX_SOURCE_COMPILES("