diff --git a/framework/base/media/AVAFPacket.h b/framework/base/media/AVAFPacket.h
index 62a98853c..175c70412 100644
--- a/framework/base/media/AVAFPacket.h
+++ b/framework/base/media/AVAFPacket.h
@@ -55,7 +55,7 @@ class AVAFPacket : public IAFPacket {
 };
 
 
-class AVAFFrame : public IAFFrame {
+class CICADA_CPLUS_EXTERN AVAFFrame : public IAFFrame {
 public:
     explicit AVAFFrame(AVFrame *frame, FrameType type = FrameTypeUnknown);
 
diff --git a/framework/codec/ActiveDecoder.h b/framework/codec/ActiveDecoder.h
index 7f27ed656..571a98fb8 100644
--- a/framework/codec/ActiveDecoder.h
+++ b/framework/codec/ActiveDecoder.h
@@ -18,7 +18,7 @@
 #include <base/media/spsc_queue.h>
 #include <queue>
 
-class ActiveDecoder : public Cicada::IDecoder {
+class CICADA_CPLUS_EXTERN ActiveDecoder : public Cicada::IDecoder {
 
 public:
     ActiveDecoder();
diff --git a/framework/codec/codecPrototype.h b/framework/codec/codecPrototype.h
index e9d075c18..50e9601e9 100644
--- a/framework/codec/codecPrototype.h
+++ b/framework/codec/codecPrototype.h
@@ -7,8 +7,8 @@
 #include <memory>
 #include "IDecoder.h"
 
-class codecPrototype {
-//    static vector<codecPrototype *> codecQueue;
+class CICADA_CPLUS_EXTERN codecPrototype {
+    //    static vector<codecPrototype *> codecQueue;
     static codecPrototype*  codecQueue [10];
     static int _nextSlot;
 public:
@@ -21,7 +21,6 @@ class codecPrototype {
     static void addPrototype(codecPrototype *se);
 
     static Cicada::IDecoder *create(AFCodecID code, uint64_t flags, int maxSize);
-
 };