diff --git a/lib_xua/src/core/audiohub/xua_audiohub_st.h b/lib_xua/src/core/audiohub/xua_audiohub_st.h
index 80c651fb..7669c799 100644
--- a/lib_xua/src/core/audiohub/xua_audiohub_st.h
+++ b/lib_xua/src/core/audiohub/xua_audiohub_st.h
@@ -1,3 +1,5 @@
+extern unsigned DoSampleTransfer(chanend ?c_out, const int readBuffNo, const unsigned underflowWord);
+
 #pragma unsafe arrays
 inline unsigned DoSampleTransfer(chanend ?c_out, const int readBuffNo, const unsigned underflowWord)
 {