diff --git a/xen/include/asm-x86/mtrr.h b/xen/include/asm-x86/mtrr.h
index 7edcb94479..4be704cb6a 100644
--- a/xen/include/asm-x86/mtrr.h
+++ b/xen/include/asm-x86/mtrr.h
@@ -92,7 +92,12 @@ extern bool_t mtrr_fix_range_msr_set(struct domain *, struct mtrr_state *,
                                      uint32_t row, uint64_t msr_content);
 extern bool_t mtrr_def_type_msr_set(struct domain *, struct mtrr_state *,
                                     uint64_t msr_content);
+#ifdef CONFIG_HVM
 extern void memory_type_changed(struct domain *);
+#else
+static inline void memory_type_changed(struct domain *d) {}
+#endif
+
 extern bool_t pat_msr_set(uint64_t *pat, uint64_t msr);
 
 bool is_var_mtrr_overlapped(const struct mtrr_state *m);