diff --git a/avformat/context.go b/avformat/context.go
index 476f8e5..ba49068 100644
--- a/avformat/context.go
+++ b/avformat/context.go
@@ -11,6 +11,7 @@ import (
 	"unsafe"
 
 	"github.com/giorgisio/goav/avcodec"
+	"github.com/giorgisio/goav/avutil"
 )
 
 const (
diff --git a/avformat/context_struct.go b/avformat/context_struct.go
index 2d2696a..2e721c7 100644
--- a/avformat/context_struct.go
+++ b/avformat/context_struct.go
@@ -9,6 +9,8 @@ import "C"
 import (
 	"reflect"
 	"unsafe"
+
+	"github.com/giorgisio/goav/avutil"
 )
 
 func (ctxt *Context) Chapters() **AvChapter {
diff --git a/avformat/stream_struct.go b/avformat/stream_struct.go
index fe87264..d2c8f76 100644
--- a/avformat/stream_struct.go
+++ b/avformat/stream_struct.go
@@ -10,6 +10,7 @@ import (
 	"unsafe"
 
 	"github.com/giorgisio/goav/avcodec"
+	"github.com/giorgisio/goav/avutil"
 )
 
 func (avs *Stream) CodecParameters() *avcodec.AvCodecParameters {