diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c
index 58f0467062..b360f49efe 100644
--- a/migration/dirtyrate.c
+++ b/migration/dirtyrate.c
@@ -485,7 +485,7 @@ static bool record_ramblock_hash_info(struct RamblockDirtyInfo **block_dinfo,
 {
     struct RamblockDirtyInfo *info = NULL;
     struct RamblockDirtyInfo *dinfo = NULL;
-    RAMBlock *block = NULL;
+    RAMBlock *block;
     int total_count = 0;
     int index = 0;
     bool ret = false;
@@ -568,7 +568,7 @@ static bool compare_page_hash_info(struct RamblockDirtyInfo *info,
                                   int block_count)
 {
     struct RamblockDirtyInfo *block_dinfo = NULL;
-    RAMBlock *block = NULL;
+    RAMBlock *block;
 
     RAMBLOCK_FOREACH_MIGRATABLE(block) {
         if (skip_sample_ramblock(block)) {