diff --git a/gst/videomixer/videomixer2.c b/gst/videomixer/videomixer2.c
index 95c8f216e6..f3d0f80c6d 100644
--- a/gst/videomixer/videomixer2.c
+++ b/gst/videomixer/videomixer2.c
@@ -836,10 +836,17 @@ gst_videomixer2_blend_buffers (GstVideoMixer2 * mix,
       mix->fill_color (&outframe, 240, 128, 128);
       break;
     case VIDEO_MIXER2_BACKGROUND_TRANSPARENT:
-      gst_buffer_memset (*outbuf, 0, 0, outsize);
+    {
+      guint i, num_maps;
+
+      num_maps = (outframe.meta) ? GST_VIDEO_FRAME_N_PLANES (&outframe) : 1;
+      for (i = 0; i < num_maps; ++i)
+        memset (outframe.map[i].data, 0, outframe.map[i].size);
+
       /* use overlay to keep background transparent */
       composite = mix->overlay;
       break;
+    }
   }
 
   for (l = mix->sinkpads; l; l = l->next) {
diff --git a/tests/check/pipelines/simple-launch-lines.c b/tests/check/pipelines/simple-launch-lines.c
index 326d357d8d..4dedbe3d88 100644
--- a/tests/check/pipelines/simple-launch-lines.c
+++ b/tests/check/pipelines/simple-launch-lines.c
@@ -220,7 +220,8 @@ GST_START_TEST (test_rtp_payloaders)
   /*s = FAKESRC " ! ! rtpsv3vdepay ! " FAKESINK; */
 }
 
-GST_END_TEST
+GST_END_TEST;
+
 GST_START_TEST (test_video_encoders_decoders)
 {
   const gchar *s;
@@ -253,7 +254,26 @@ GST_START_TEST (test_video_encoders_decoders)
   }
 }
 
-GST_END_TEST
+GST_END_TEST;
+
+#define VIDEOMIXER_PIPELINE \
+    "videomixer name=mix  background=transparent ! fakesink " \
+    "videotestsrc num-buffers=50 ! " \
+    "  video/x-raw,format=RGBA, width=200,height=200,framerate=10/1  ! " \
+    "  videoconvert ! mix.sink_1 " \
+    "videotestsrc num-buffers=50 pattern=smpte ! " \
+    "  video/x-raw,format=RGBA, width=720,height=480,framerate=10/1  ! " \
+    "  videoconvert ! mix.sink_0 "
+
+GST_START_TEST (test_videomixer)
+{
+  run_pipeline (setup_pipeline (VIDEOMIXER_PIPELINE), VIDEOMIXER_PIPELINE,
+      GST_MESSAGE_ANY & ~(GST_MESSAGE_ERROR | GST_MESSAGE_WARNING),
+      GST_MESSAGE_UNKNOWN, GST_STATE_PLAYING);
+}
+
+GST_END_TEST;
+
 #endif /* #ifndef GST_DISABLE_PARSE */
 static Suite *
 simple_launch_lines_suite (void)
@@ -268,6 +288,8 @@ simple_launch_lines_suite (void)
 #ifndef GST_DISABLE_PARSE
   tcase_add_test (tc_chain, test_rtp_payloaders);
   tcase_add_test (tc_chain, test_video_encoders_decoders);
+  /* FIXME: very rarely fails, maybe because of negotiation issues? */
+  tcase_skip_broken_test (tc_chain, test_videomixer);
 #endif
   return s;
 }