diff --git a/cpu-common.h b/cpu-common.h
index 321037fbc0..85548de5ea 100644
--- a/cpu-common.h
+++ b/cpu-common.h
@@ -69,9 +69,7 @@ void cpu_physical_memory_unmap(void *buffer, target_phys_addr_t len,
 void *cpu_register_map_client(void *opaque, void (*callback)(void *opaque));
 void cpu_unregister_map_client(void *cookie);
 
-#ifndef CONFIG_USER_ONLY
 bool cpu_physical_memory_is_io(target_phys_addr_t phys_addr);
-#endif
 
 /* Coalesced MMIO regions are areas where write operations can be reordered.
  * This usually implies that write operations are side-effect free.  This allows