diff --git a/include/exec/memory.h b/include/exec/memory.h
index 260ddd8..500bfc0 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -776,9 +776,9 @@
     return qatomic_rcu_read(&as->current_map);
 }
 
-typedef int (*flatview_cb)(Int128 start,
-                           Int128 len,
-                           const MemoryRegion*, void*);
+typedef bool (*flatview_cb)(Int128 start,
+                            Int128 len,
+                            const MemoryRegion*, void*);
 
 void flatview_for_each_range(FlatView *fv, flatview_cb cb , void *opaque);