diff --git a/parse.go b/parse.go
index 3a409a6..0cb2541 100644
--- a/parse.go
+++ b/parse.go
@@ -9,7 +9,6 @@ package bencode
 
 import (
 	"bufio"
-	"bytes"
 	"fmt"
 	"io"
 	"os"
@@ -73,7 +72,7 @@ func collectInt(r Reader, delim byte) (buf []byte, err os.Error) {
 			err = os.NewError("expected digit")
 			return
 		}
-		buf = bytes.AddByte(buf, c)
+		buf = append(buf, c)
 	}
 	return
 }
diff --git a/struct.go b/struct.go
index 7654d61..cd9b583 100644
--- a/struct.go
+++ b/struct.go
@@ -144,7 +144,7 @@ func (b *structBuilder) Elem(i int) Builder {
 				n *= 2
 			}
 			nv := reflect.MakeSlice(v.Type().(*reflect.SliceType), v.Len(), n)
-			reflect.ArrayCopy(nv, v)
+			reflect.Copy(nv, v)
 			v.Set(nv)
 		}
 		if v.Len() <= i && i < v.Cap() {