diff --git a/cmake/QtProcessConfigureArgs.cmake b/cmake/QtProcessConfigureArgs.cmake
index bc776b4b18f..74d60fe815c 100644
--- a/cmake/QtProcessConfigureArgs.cmake
+++ b/cmake/QtProcessConfigureArgs.cmake
@@ -831,7 +831,7 @@ function(guess_compiler_from_mkspec)
         push("-DCMAKE_CXX_COMPILER=${cxx_compiler}")
     endif()
     if(mkspec MATCHES "-libc\\+\\+$")
-        push("-DINPUT_stdlib_libcpp=ON")
+        push("-DFEATURE_stdlib_libcpp=ON")
     endif()
     set(cmake_args "${cmake_args}" PARENT_SCOPE)
 endfunction()