diff --git a/src/add-ons/kernel/drivers/audio/ac97/sis7018/Mixer.cpp b/src/add-ons/kernel/drivers/audio/ac97/sis7018/Mixer.cpp
index 5ad29ee599..d5056a4812 100644
--- a/src/add-ons/kernel/drivers/audio/ac97/sis7018/Mixer.cpp
+++ b/src/add-ons/kernel/drivers/audio/ac97/sis7018/Mixer.cpp
@@ -612,6 +612,8 @@ Mixer::ListMixControls(multi_mix_control_info* Info)
 		_CreateMIXControlGroup(Info, index, recordGroup, RecordControls[i]);
 	}
 
+	Info->control_count = index;
+
 	return B_OK;
 }
 
diff --git a/src/add-ons/kernel/drivers/audio/usb/AudioControlInterface.cpp b/src/add-ons/kernel/drivers/audio/usb/AudioControlInterface.cpp
index 042817ea41..1a20f7c91c 100644
--- a/src/add-ons/kernel/drivers/audio/usb/AudioControlInterface.cpp
+++ b/src/add-ons/kernel/drivers/audio/usb/AudioControlInterface.cpp
@@ -1855,6 +1855,8 @@ AudioControlInterface::ListMixControls(multi_mix_control_info* Info)
 			I != MixerControlsMap.End(); I++)
 		_ListMixControlsForMixerUnit(index, Info, I->Value());
 
+	Info->control_count = index;
+
 	return B_OK;
 }