diff --git a/dynamic_tree.go b/dynamic_tree.go
index af23a6a..720268c 100644
--- a/dynamic_tree.go
+++ b/dynamic_tree.go
@@ -221,7 +221,7 @@ func (i *Intermediate) Spawn(maxLevel int) error {
 func (i *Intermediate) Collect() error {
 	for s := range i.collect {
 		i.size += s
-		i.refer <- i.size
+		i.refer <- s
 	}
 	close(i.refer)
 	return nil
@@ -330,7 +330,7 @@ func (b *Bottom) Spawn(maxLevel int) error {
 func (b *Bottom) Collect() error {
 	for s := range b.collect {
 		b.size += s
-		b.refer <- b.size
+		b.refer <- s
 	}
 	close(b.refer)
 	return nil
diff --git a/real_walker.go b/real_walker.go
index feeef71..e991d15 100644
--- a/real_walker.go
+++ b/real_walker.go
@@ -11,10 +11,13 @@ type RealWalker struct {
 }
 
 func (r *RealWalker) walkFunc(path string, info os.FileInfo, err error) error {
-	switch mode := info.Mode(); {
-	case mode.IsRegular():
-		r.report <- info.Size()
+	if !info.IsDir() {
+		switch mode := info.Mode(); {
+		case mode.IsRegular():
+			r.report <- info.Size()
+		}
 	}
+
 	return nil
 }