diff --git a/gst-libs/gst/video/video-converter.c b/gst-libs/gst/video/video-converter.c
index fa655f578f..10d310e15a 100644
--- a/gst-libs/gst/video/video-converter.c
+++ b/gst-libs/gst/video/video-converter.c
@@ -298,7 +298,7 @@ struct _GstLineCache
   gpointer need_line_data;
   GDestroyNotify need_line_notify;
 
-  gboolean n_lines;
+  guint n_lines;
   guint stride;
   GstLineCacheAllocLineFunc alloc_line;
   gpointer alloc_line_data;