diff --git a/sys/v4l/gstv4lmjpegsink.c b/sys/v4l/gstv4lmjpegsink.c
index e2f42c769e..c6edb7512d 100644
--- a/sys/v4l/gstv4lmjpegsink.c
+++ b/sys/v4l/gstv4lmjpegsink.c
@@ -184,7 +184,7 @@ gst_v4lmjpegsink_init (GstV4lMjpegSink *v4lmjpegsink)
   v4lmjpegsink->bufferpool = gst_buffer_pool_new(
 				  NULL, 
 				  NULL,
-				  gst_v4lmjpegsink_buffer_new,
+				  (GstBufferPoolBufferNewFunction)gst_v4lmjpegsink_buffer_new,
 				  NULL,
 				  NULL,
 				  v4lmjpegsink);
diff --git a/sys/v4l/gstv4lmjpegsrc.c b/sys/v4l/gstv4lmjpegsrc.c
index f13669f8b3..8f70dd02a2 100644
--- a/sys/v4l/gstv4lmjpegsrc.c
+++ b/sys/v4l/gstv4lmjpegsrc.c
@@ -191,9 +191,9 @@ gst_v4lmjpegsrc_init (GstV4lMjpegSrc *v4lmjpegsrc)
   v4lmjpegsrc->bufferpool = gst_buffer_pool_new(
 		  			NULL,
 					NULL,
-					gst_v4lmjpegsrc_buffer_new,
+					(GstBufferPoolBufferNewFunction)gst_v4lmjpegsrc_buffer_new,
 					NULL,
-					gst_v4lmjpegsrc_buffer_free,
+					(GstBufferPoolBufferFreeFunction)gst_v4lmjpegsrc_buffer_free,
 					v4lmjpegsrc);
 
   v4lmjpegsrc->frame_width = 0;
diff --git a/sys/v4l/gstv4lsrc.c b/sys/v4l/gstv4lsrc.c
index a337d5c4a2..972b024966 100644
--- a/sys/v4l/gstv4lsrc.c
+++ b/sys/v4l/gstv4lsrc.c
@@ -168,9 +168,9 @@ gst_v4lsrc_init (GstV4lSrc *v4lsrc)
   v4lsrc->bufferpool = gst_buffer_pool_new(
 		  NULL, 
 		  NULL,
-		  gst_v4lsrc_buffer_new,
+		  (GstBufferPoolBufferNewFunction)gst_v4lsrc_buffer_new,
 		  NULL,
-		  gst_v4lsrc_buffer_free,
+		  (GstBufferPoolBufferFreeFunction)gst_v4lsrc_buffer_free,
 		  v4lsrc);
 
   v4lsrc->palette = 0; /* means 'any' - user can specify a specific palette */