diff --git a/libao2/ao_v4l2.c b/libao2/ao_v4l2.c
index a9e386a448..3781fab359 100644
--- a/libao2/ao_v4l2.c
+++ b/libao2/ao_v4l2.c
@@ -33,6 +33,7 @@
 #include "audio_out_internal.h"
 #include "libaf/af_format.h"
 #include "libmpdemux/mpeg_packetizer.h"
+#include "libvo/vo_v4l2.h"
 
 #define MPEG_AUDIO_ID 0x1C0
 
@@ -144,8 +145,6 @@ get_space (void)
 static int
 play (void *data, int len, int flags)
 {
-  int v4l2_write (unsigned char *data, int len);
-
   if (ao_data.format != AF_FORMAT_MPEG2)
     return 0;
 
diff --git a/libvo/vo_v4l2.c b/libvo/vo_v4l2.c
index f2e6535bab..b60edea878 100644
--- a/libvo/vo_v4l2.c
+++ b/libvo/vo_v4l2.c
@@ -42,6 +42,7 @@
 #include "video_out.h"
 #include "video_out_internal.h"
 #include "libmpdemux/mpeg_packetizer.h"
+#include "vo_v4l2.h"
 
 #define DEFAULT_MPEG_DECODER "/dev/video16"
 #define V4L2_VO_HDR "VO: [v4l2]"
diff --git a/libvo/vo_v4l2.h b/libvo/vo_v4l2.h
new file mode 100644
index 0000000000..0e6a45522a
--- /dev/null
+++ b/libvo/vo_v4l2.h
@@ -0,0 +1,28 @@
+/*
+ * video output for V4L2 hardware MPEG decoders
+ *
+ * Copyright (C) 2007 Benjamin Zores
+ *
+ * This file is part of MPlayer.
+ *
+ * MPlayer is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * MPlayer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with MPlayer; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPLAYER_VO_V4L2_H
+#define MPLAYER_VO_V4L2_H
+
+int v4l2_write (unsigned char *data, int len);
+
+#endif /* MPLAYER_VO_V4L2_H */