diff --git a/config/StdGNU.mk b/config/StdGNU.mk
index 6be8233205..039274ea61 100644
--- a/config/StdGNU.mk
+++ b/config/StdGNU.mk
@@ -35,7 +35,3 @@ UTIL_LIBS = -lutil
 SONAME_LDFLAG = -soname
 SHLIB_LDFLAGS = -shared
 
-ifeq ($(lto),y)
-CFLAGS += -flto
-LDFLAGS-$(clang) += -plugin LLVMgold.so
-endif
diff --git a/xen/Rules.mk b/xen/Rules.mk
index 24d13dcad1..77bcd44922 100644
--- a/xen/Rules.mk
+++ b/xen/Rules.mk
@@ -120,6 +120,8 @@ $(filter-out %.init.o $(nogcov-y),$(obj-y) $(obj-bin-y) $(extra-y)): CFLAGS += -
 endif
 
 ifeq ($(CONFIG_LTO),y)
+CFLAGS += -flto
+LDFLAGS-$(clang) += -plugin LLVMgold.so
 # Would like to handle all object files as bitcode, but objects made from
 # pure asm are in a different format and have to be collected separately.
 # Mirror the directory tree, collecting them as built_in_bin.o.