diff --git a/platform/posix/wav_util.h b/platform/posix/wav_util.h
index a4f3fe2ce..bbb5d463d 100644
--- a/platform/posix/wav_util.h
+++ b/platform/posix/wav_util.h
@@ -35,6 +35,9 @@
  *
  */
 
+#ifndef WAV_UIL_H
+#define WAV_UIL_H
+
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -42,6 +45,10 @@
 #include <fcntl.h>
 #include <unistd.h>
 
+#if defined __cplusplus
+extern "C" {
+#endif
+
 // return 0 if ok
 
 /**
@@ -92,3 +99,8 @@ int wav_reader_read_int16(int num_samples, int16_t * data);
  */
 int wav_reader_close(void);
 
+#if defined __cplusplus
+}
+#endif
+
+#endif // WAV_UTIL_H
diff --git a/test/hfp/cvsd_plc_test.c b/test/hfp/cvsd_plc_test.c
index bafa2edf0..94a8b3475 100644
--- a/test/hfp/cvsd_plc_test.c
+++ b/test/hfp/cvsd_plc_test.c
@@ -161,7 +161,7 @@ static void process_wav_file_with_plc(const char * in_filename, const char * out
     
     while (wav_reader_read_int16(audio_samples_per_frame, audio_frame_in) == 0){
         int16_t audio_frame_out[audio_samples_per_frame];
-        btstack_cvsd_plc_process_data(&plc_state, audio_frame_in, audio_samples_per_frame, audio_frame_out);
+        btstack_cvsd_plc_process_data(&plc_state, false, audio_frame_in, audio_samples_per_frame, audio_frame_out);
         wav_writer_write_int16(audio_samples_per_frame, audio_frame_out);
     } 
     wav_reader_close();
diff --git a/test/hfp/pklg_cvsd_test.c b/test/hfp/pklg_cvsd_test.c
index 50fac339a..251147d41 100644
--- a/test/hfp/pklg_cvsd_test.c
+++ b/test/hfp/pklg_cvsd_test.c
@@ -158,12 +158,12 @@ static void process_file(const char * pklg_path, const char * wav_path, int pack
 
             if (plc_enabled){
                 if (num_samples > 60){
-                    btstack_cvsd_plc_process_data(&plc_state, audio_frame_in, 60, audio_frame_out);
+                    btstack_cvsd_plc_process_data(&plc_state, false, audio_frame_in, 60, audio_frame_out);
                     wav_writer_write_int16(60, audio_frame_out);
-                    btstack_cvsd_plc_process_data(&plc_state, &audio_frame_in[60], num_samples - 60, audio_frame_out);
+                    btstack_cvsd_plc_process_data(&plc_state, false, &audio_frame_in[60], num_samples - 60, audio_frame_out);
                     wav_writer_write_int16(num_samples - 60, audio_frame_out);
                 } else {
-                    btstack_cvsd_plc_process_data(&plc_state, audio_frame_in, num_samples, audio_frame_out);
+                    btstack_cvsd_plc_process_data(&plc_state, false, audio_frame_in, num_samples, audio_frame_out);
                     wav_writer_write_int16(num_samples, audio_frame_out);
                 }
             } else {