diff --git a/BasiliskII/src/Unix/Irix/audio_irix.cpp b/BasiliskII/src/Unix/Irix/audio_irix.cpp
index c81b6b4c..993b5f0b 100644
--- a/BasiliskII/src/Unix/Irix/audio_irix.cpp
+++ b/BasiliskII/src/Unix/Irix/audio_irix.cpp
@@ -352,16 +352,19 @@ void AudioInterrupt(void)
  *  It is guaranteed that AudioStatus.num_sources == 0
  */
 
-void audio_set_sample_rate(int index)
+bool audio_set_sample_rate(int index)
 {
+	return true;
 }
 
-void audio_set_sample_size(int index)
+bool audio_set_sample_size(int index)
 {
+	return true;
 }
 
-void audio_set_channels(int index)
+bool audio_set_channels(int index)
 {
+	return true;
 }
 
 
diff --git a/BasiliskII/src/Unix/Solaris/audio_solaris.cpp b/BasiliskII/src/Unix/Solaris/audio_solaris.cpp
index 1d71278a..254ed5a0 100644
--- a/BasiliskII/src/Unix/Solaris/audio_solaris.cpp
+++ b/BasiliskII/src/Unix/Solaris/audio_solaris.cpp
@@ -268,16 +268,19 @@ void AudioInterrupt(void)
  *  It is guaranteed that AudioStatus.num_sources == 0
  */
 
-void audio_set_sample_rate(int index)
+bool audio_set_sample_rate(int index)
 {
+	return true;
 }
 
-void audio_set_sample_size(int index)
+bool audio_set_sample_size(int index)
 {
+	return true;
 }
 
-void audio_set_channels(int index)
+bool audio_set_channels(int index)
 {
+	return true;
 }