diff --git a/util/hbitmap.c b/util/hbitmap.c
index 242c6e519c..7f9b3e0cd7 100644
--- a/util/hbitmap.c
+++ b/util/hbitmap.c
@@ -716,6 +716,7 @@ HBitmap *hbitmap_alloc(uint64_t size, int granularity)
     HBitmap *hb = g_new0(struct HBitmap, 1);
     unsigned i;
 
+    assert(size <= INT64_MAX);
     hb->orig_size = size;
 
     assert(granularity >= 0 && granularity < 64);
@@ -746,6 +747,7 @@ void hbitmap_truncate(HBitmap *hb, uint64_t size)
     uint64_t num_elements = size;
     uint64_t old;
 
+    assert(size <= INT64_MAX);
     hb->orig_size = size;
 
     /* Size comes in as logical elements, adjust for granularity. */