diff --git a/migration/page_cache.c b/migration/page_cache.c
index 381e555ddb..6b2dd77cf0 100644
--- a/migration/page_cache.c
+++ b/migration/page_cache.c
@@ -39,12 +39,12 @@ struct CacheItem {
 
 struct PageCache {
     CacheItem *page_cache;
-    unsigned int page_size;
-    int64_t max_num_items;
-    int64_t num_items;
+    size_t page_size;
+    size_t max_num_items;
+    size_t num_items;
 };
 
-PageCache *cache_init(int64_t num_pages, unsigned int page_size)
+PageCache *cache_init(size_t num_pages, size_t page_size)
 {
     int64_t i;
 
diff --git a/migration/page_cache.h b/migration/page_cache.h
index 4fadd0c501..931868b857 100644
--- a/migration/page_cache.h
+++ b/migration/page_cache.h
@@ -28,7 +28,7 @@ typedef struct PageCache PageCache;
  * @num_pages: cache maximal number of cached pages
  * @page_size: cache page size
  */
-PageCache *cache_init(int64_t num_pages, unsigned int page_size);
+PageCache *cache_init(size_t num_pages, size_t page_size);
 
 /**
  * cache_fini: free all cache resources