diff --git a/linux-tkg-config/prepare b/linux-tkg-config/prepare
index 0b3a5e6..75e30f5 100644
--- a/linux-tkg-config/prepare
+++ b/linux-tkg-config/prepare
@@ -718,7 +718,7 @@ _tkg_srcprep() {
     fi
   fi
   # Clang LTO
-  if [ "$_compiler_name" = "-llvm" ] && [ $_basever -ge 512 ]; then
+  if [ "$_compiler_name" = "-llvm" ] && ( [[ "$_basever" = 6* ]] || [ $_basever -ge 512 ] ); then
     if [ "$_lto_mode" = "full" ]; then
       _enable LTO_CLANG_FULL
       _disable LTO_CLANG_THIN