diff --git a/audio/drivers/alsa.c b/audio/drivers/alsa.c
index 0b4a359d66..2c875a22b4 100644
--- a/audio/drivers/alsa.c
+++ b/audio/drivers/alsa.c
@@ -351,7 +351,7 @@ static void *alsa_device_list_new(void *data)
       /* description of device IOID - input / output identifcation
        * ("Input" or "Output"), NULL means both) */
 
-      if (io == NULL)
+      if (!io || !strcmp(io,"Output"))
          string_list_append(s, name, attr);
 
       if (name)
diff --git a/audio/drivers/alsathread.c b/audio/drivers/alsathread.c
index 83175b3c56..f8a2c53e9f 100644
--- a/audio/drivers/alsathread.c
+++ b/audio/drivers/alsathread.c
@@ -369,7 +369,7 @@ static void *alsa_device_list_new(void *data)
       /* description of device IOID - input / output identifcation
        * ("Input" or "Output"), NULL means both) */
 
-      if (io == NULL)
+      if (!io || !strcmp(io,"Output"))
          string_list_append(s, name, attr);
 
       if (name)