diff --git a/Source/bluetooth/audio/SDPProfile.h b/Source/bluetooth/audio/SDPProfile.h
index fb100e2..55065c3 100644
--- a/Source/bluetooth/audio/SDPProfile.h
+++ b/Source/bluetooth/audio/SDPProfile.h
@@ -1212,7 +1212,7 @@ namespace SDP {
         ClientSocket& _socket;
     }; // class Client
 
-    class Server {
+    class EXTERNAL Server {
         using Handler = ServerSocket::ResponseHandler;
 
     public:
diff --git a/Source/bluetooth/audio/codecs/SBC.h b/Source/bluetooth/audio/codecs/SBC.h
index aada5cf..e480361 100644
--- a/Source/bluetooth/audio/codecs/SBC.h
+++ b/Source/bluetooth/audio/codecs/SBC.h
@@ -29,7 +29,7 @@ namespace Bluetooth {
 
 namespace A2DP {
 
-    class SBC : public IAudioCodec {
+    class EXTERNAL SBC : public IAudioCodec {
     public:
         static constexpr uint8_t CODEC_TYPE = 0x00; // SBC
 
diff --git a/Source/bluetooth/gatt/CMakeLists.txt b/Source/bluetooth/gatt/CMakeLists.txt
index 702f6b9..cf99854 100644
--- a/Source/bluetooth/gatt/CMakeLists.txt
+++ b/Source/bluetooth/gatt/CMakeLists.txt
@@ -40,6 +40,7 @@ set(PUBLIC_HEADERS
 add_library(${TARGET}
     GATTSocket.cpp
     GATTProfile.cpp
+    Module.cpp
 )
 
 target_link_libraries(${TARGET}