diff --git a/mod_php_install.sh b/mod_php_install.sh
index baf0d46..99021d5 100755
--- a/mod_php_install.sh
+++ b/mod_php_install.sh
@@ -6417,7 +6417,7 @@ if main_version_eq "7.4" ; then
    export CXXFLAGS="-O2 -pipe -std=gnu++17"
    export CFLAGS="-O2 -pipe"
 fi
-if main_version_eq "8.0" ; then
+if main_version_eq "8.0"  ||  main_version_eq "8.1" ; then
 #   cp -a build/php_cxx_compile_stdcxx.m4 build/php_cxx_compile_stdcxx.m4.ORIG
 #
 #sed -i 's/-std=c++11/-std=gnu++17/g' build/php_cxx_compile_stdcxx.m4