diff --git a/internal/checker/checker.go b/internal/checker/checker.go
index 0b645caa1..432bfa742 100644
--- a/internal/checker/checker.go
+++ b/internal/checker/checker.go
@@ -569,12 +569,24 @@ func (c *Checker) checkTree(id restic.ID, tree *restic.Tree) (errs []error) {
 				errs = append(errs, Error{TreeID: id, Err: errors.Errorf("file %q has nil blob list", node.Name)})
 			}
 
+			var size uint64
 			for b, blobID := range node.Content {
 				if blobID.IsNull() {
 					errs = append(errs, Error{TreeID: id, Err: errors.Errorf("file %q blob %d has null ID", node.Name, b)})
 					continue
 				}
 				blobs = append(blobs, blobID)
+				blobSize, found := c.repo.LookupBlobSize(blobID, restic.DataBlob)
+				if !found {
+					errs = append(errs, Error{TreeID: id, Err: errors.Errorf("file %q blob %d size could not be found", node.Name, b)})
+				}
+				size += uint64(blobSize)
+			}
+			if size != node.Size {
+				errs = append(errs, Error{
+					TreeID: id,
+					Err:    errors.Errorf("file %q: metadata size (%v) and sum of blob sizes (%v) do not match", node.Name, node.Size, size),
+				})
 			}
 		case "dir":
 			if node.Subtree == nil {