Index: gst/videomixer/videomixer.c
===================================================================
--- gst/videomixer/videomixer.c	(revision 256)
+++ gst/videomixer/videomixer.c	(revision 257)
@@ -1035,7 +1035,7 @@
     if (mixcol->buffer != NULL && GST_CLOCK_TIME_IS_VALID (pad->queued)) {
       pad->queued -= interval;
       GST_DEBUG_OBJECT (pad, "queued now %lld", pad->queued);
-      if (pad->queued == 0) {
+      if ( (gint64) pad->queued <= 0) {
         GST_DEBUG ("unreffing buffer");
         gst_buffer_unref (mixcol->buffer);
         mixcol->buffer = NULL;
