diff --git a/include/exec/cpu-all.h b/include/exec/cpu-all.h
index 7c3a5e7dd0..62f558103d 100644
--- a/include/exec/cpu-all.h
+++ b/include/exec/cpu-all.h
@@ -316,6 +316,7 @@ typedef struct RAMBlock {
 static inline void *ramblock_ptr(RAMBlock *block, ram_addr_t offset)
 {
     assert(offset < block->length);
+    assert(block->host);
     return (char *)block->host + offset;
 }