diff --git a/.github/workflows/MkRules.local.in b/.github/workflows/MkRules.local.in
index 29a9d773deb..a03826205d5 100644
--- a/.github/workflows/MkRules.local.in
+++ b/.github/workflows/MkRules.local.in
@@ -33,3 +33,5 @@ TEXI2DVI = TEXINDEX=@texindex@ texify
 
 ## Workaround for msys2?
 #export MSYS2_ENV_CONV_EXCL="R_ARCH"
+LTO = -flto
+