diff --git a/ext/pulse/pulsesrc.c b/ext/pulse/pulsesrc.c
index 31ead0cfe2..30c6e7ff4e 100644
--- a/ext/pulse/pulsesrc.c
+++ b/ext/pulse/pulsesrc.c
@@ -621,7 +621,7 @@ gst_pulsesrc_set_stream_volume (GstPulseSrc * pulsesrc, gdouble volume)
   if (!pulsesrc->mainloop)
     goto no_mainloop;
 
-  if (!pulsesrc->source_output_idx)
+  if (pulsesrc->source_output_idx == PA_INVALID_INDEX)
     goto no_index;
 
   pa_threaded_mainloop_lock (pulsesrc->mainloop);
@@ -676,7 +676,7 @@ gst_pulsesrc_set_stream_mute (GstPulseSrc * pulsesrc, gboolean mute)
   if (!pulsesrc->mainloop)
     goto no_mainloop;
 
-  if (!pulsesrc->source_output_idx)
+  if (pulsesrc->source_output_idx == PA_INVALID_INDEX)
     goto no_index;
 
   pa_threaded_mainloop_lock (pulsesrc->mainloop);
@@ -729,7 +729,7 @@ gst_pulsesrc_set_stream_device (GstPulseSrc * pulsesrc, const gchar * device)
   if (!pulsesrc->mainloop)
     goto no_mainloop;
 
-  if (!pulsesrc->source_output_idx)
+  if (pulsesrc->source_output_idx == PA_INVALID_INDEX)
     goto no_index;
 
   pa_threaded_mainloop_lock (pulsesrc->mainloop);