diff --git a/src/corelib/Qt5CoreMacros.cmake b/src/corelib/Qt5CoreMacros.cmake
index c06c91324b..b0d9135010 100644
--- a/src/corelib/Qt5CoreMacros.cmake
+++ b/src/corelib/Qt5CoreMacros.cmake
@@ -150,7 +150,7 @@ function(QT5_WRAP_CPP outfiles )
     set(moc_options ${_WRAP_CPP_OPTIONS})
     foreach(it ${moc_files})
         get_filename_component(it ${it} ABSOLUTE)
-        qt5_make_output_file(${it} moc_ cxx outfile)
+        qt5_make_output_file(${it} moc_ cpp outfile)
         qt5_create_moc_command(${it} ${outfile} "${moc_flags}" "${moc_options}")
         list(APPEND ${outfiles} ${outfile})
     endforeach()
@@ -175,7 +175,7 @@ function(QT5_ADD_RESOURCES outfiles )
         get_filename_component(outfilename ${it} NAME_WE)
         get_filename_component(infile ${it} ABSOLUTE)
         get_filename_component(rc_path ${infile} PATH)
-        set(outfile ${CMAKE_CURRENT_BINARY_DIR}/qrc_${outfilename}.cxx)
+        set(outfile ${CMAKE_CURRENT_BINARY_DIR}/qrc_${outfilename}.cpp)
 
         set(_RC_DEPENDS)
         if(EXISTS "${infile}")