diff --git a/spop/frame.go b/spop/frame.go
index 0587c05..d347c4e 100644
--- a/spop/frame.go
+++ b/spop/frame.go
@@ -65,7 +65,7 @@ func (f *frame) ReadFrom(r io.Reader) (int64, error) {
 		return int64(n + len(f.length)), io.ErrUnexpectedEOF
 	}
 
-	return int64(n + len(f.length)), f.decodeHeader()
+	return int64(uint32Len + n + len(f.length)), f.decodeHeader()
 }
 
 func (f *frame) WriteTo(w io.Writer) (int64, error) {
@@ -76,7 +76,7 @@ func (f *frame) WriteTo(w io.Writer) (int64, error) {
 	}
 
 	n, err := w.Write(f.buf.ReadBytes())
-	return int64(n + len(f.length)), err
+	return int64(uint32Len + n + len(f.length)), err
 }
 
 func (f *frame) encodeHeader() error {