diff --git a/subprojects/gst-plugins-bad/sys/v4l2codecs/gstv4l2codech264dec.c b/subprojects/gst-plugins-bad/sys/v4l2codecs/gstv4l2codech264dec.c
index 0df76a2ac8..f2657c0837 100644
--- a/subprojects/gst-plugins-bad/sys/v4l2codecs/gstv4l2codech264dec.c
+++ b/subprojects/gst-plugins-bad/sys/v4l2codecs/gstv4l2codech264dec.c
@@ -984,6 +984,7 @@ gst_v4l2_codec_h264_dec_start_picture (GstH264Decoder * decoder,
       dpb);
 
   self->first_slice = TRUE;
+  self->num_slices = 0;
 
   return GST_FLOW_OK;
 }