diff --git a/src/Workflow/AudioClipWorkflow.h b/src/Workflow/AudioClipWorkflow.h
index 667ffa7358709320a9fe477e6d1f733da9205599..74ef31e60b693ab076a12efdb5caddf63c473076 100644
--- a/src/Workflow/AudioClipWorkflow.h
+++ b/src/Workflow/AudioClipWorkflow.h
@@ -30,7 +30,7 @@
 
 namespace Workflow
 {
-    struct  AudioSample;
+    class  AudioSample;
 }
 
 class   AudioClipWorkflow : public ClipWorkflow
diff --git a/src/Workflow/Types.h b/src/Workflow/Types.h
index 90b8b76880461408509aaaec59e10a11753b14ef..780bcab1c3459bc6449f37f1dee95b70d876b699 100644
--- a/src/Workflow/Types.h
+++ b/src/Workflow/Types.h
@@ -90,15 +90,16 @@ namespace   Workflow
             quint32     m_size;
             quint32     m_nbPixels;
     };
-    struct  AudioSample : public OutputBuffer
+    class  AudioSample : public OutputBuffer
     {
-        AudioSample() : OutputBuffer( AudioTrack ){}
-        unsigned char*  buff;
-        size_t          size;
-        quint32         nbSample;
-        quint32         nbChannels;
-        qint64          ptsDiff;
-        qint64          pts;
+        public:
+            AudioSample() : OutputBuffer( AudioTrack ){}
+            unsigned char*  buff;
+            size_t          size;
+            quint32         nbSample;
+            quint32         nbChannels;
+            qint64          ptsDiff;
+            qint64          pts;
     };
 }