diff --git a/src/thumbnail.c b/src/thumbnail.c
index c806ce4344d9f2d07c651c7877c0ba2ff3255c5e..012d5162d2d314f6c849a582df835da61073d7cd 100644
--- a/src/thumbnail.c
+++ b/src/thumbnail.c
@@ -144,6 +144,7 @@ void init_thumbnail_mode(void)
 
 	index_image_width = td.w;
 	index_image_height = td.h + title_area_h;
+	D(("imlib_create_image(%d, %d)", index_image_width, index_image_height));
 	td.im_main = imlib_create_image(index_image_width, index_image_height);
 	gib_imlib_image_set_has_alpha(td.im_main, 1);