diff --git a/bitcask.go b/bitcask.go
index cb2152a..e43c238 100644
--- a/bitcask.go
+++ b/bitcask.go
@@ -175,11 +175,7 @@ func (b *Bitcask) Fold(f func(key string) error) error {
 }
 
 func (b *Bitcask) put(key string, value []byte) (int64, error) {
-	size, err := b.curr.Size()
-	if err != nil {
-		return -1, err
-	}
-
+	size := b.curr.Size()
 	if size >= int64(b.config.maxDatafileSize) {
 		err := b.curr.Close()
 		if err != nil {
diff --git a/internal/datafile.go b/internal/datafile.go
index 5d16785..8dc2ad9 100644
--- a/internal/datafile.go
+++ b/internal/datafile.go
@@ -98,10 +98,10 @@ func (df *Datafile) Sync() error {
 	return df.w.Sync()
 }
 
-func (df *Datafile) Size() (int64, error) {
+func (df *Datafile) Size() int64 {
 	df.RLock()
 	defer df.RUnlock()
-	return df.offset, nil
+	return df.offset
 }
 
 func (df *Datafile) Read() (e pb.Entry, err error) {