diff --git a/tools/tests/x86_emulator/x86-emulate.h b/tools/tests/x86_emulator/x86-emulate.h
index 0ae528a741..942b4cdd47 100644
--- a/tools/tests/x86_emulator/x86-emulate.h
+++ b/tools/tests/x86_emulator/x86-emulate.h
@@ -65,6 +65,12 @@
 #define AC_(n,t) (n##t)
 #define _AC(n,t) AC_(n,t)
 
+#ifdef __GCC_ASM_FLAG_OUTPUTS__
+# define ASM_FLAG_OUT(yes, no) yes
+#else
+# define ASM_FLAG_OUT(yes, no) no
+#endif
+
 #define hweight32 __builtin_popcount
 #define hweight64 __builtin_popcountll
 
diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c b/xen/arch/x86/x86_emulate/x86_emulate.c
index b84e9ee54d..5a0ec5900a 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -132,12 +132,6 @@ static const uint8_t sse_prefix[] = { 0x66, 0xf3, 0xf2 };
         (void *)(((long)__##var + __alignof(type) - __alignof(__##var))   \
                  & -__alignof(type))
 
-#ifdef __GCC_ASM_FLAG_OUTPUTS__
-# define ASM_FLAG_OUT(yes, no) yes
-#else
-# define ASM_FLAG_OUT(yes, no) no
-#endif
-
 /* MXCSR bit definitions. */
 #define MXCSR_MM  (1U << 17)