diff --git a/xen/Rules.mk b/xen/Rules.mk
index b0bc7601c1..5aba841b0a 100644
--- a/xen/Rules.mk
+++ b/xen/Rules.mk
@@ -76,13 +76,6 @@ endif
 
 AFLAGS-y                += -D__ASSEMBLY__
 
-# Older clang's built-in assembler doesn't understand .skip with labels:
-# https://bugs.llvm.org/show_bug.cgi?id=27369
-ifeq ($(clang),y)
-$(call as-option-add,CFLAGS,CC,".L0:\n.L1:\n.skip (.L1 - .L0)",,\
-                     -no-integrated-as)
-endif
-
 ALL_OBJS := $(ALL_OBJS-y)
 
 # Get gcc to generate the dependencies for us.
diff --git a/xen/arch/x86/Rules.mk b/xen/arch/x86/Rules.mk
index 0794afa3c3..a3c5eb9de7 100644
--- a/xen/arch/x86/Rules.mk
+++ b/xen/arch/x86/Rules.mk
@@ -74,6 +74,11 @@ ifeq ($(clang),y)
 # Note: Any test which adds -no-integrated-as will cause subsequent tests to
 # succeed, and not trigger further additions.
 
+# Older clang's built-in assembler doesn't understand .skip with labels:
+# https://bugs.llvm.org/show_bug.cgi?id=27369
+$(call as-option-add,CFLAGS,CC,".L0: .L1: .skip (.L1 - .L0)",,\
+                     -no-integrated-as)
+
 # Check whether clang asm()-s support .include.
 $(call as-option-add,CFLAGS,CC,".include \"asm/indirect_thunk_asm.h\"",,\
                      -no-integrated-as)