diff --git a/scripts/resize-thumbnails.sh b/scripts/resize-thumbnails.sh
index 23491f8..61b598b 100755
--- a/scripts/resize-thumbnails.sh
+++ b/scripts/resize-thumbnails.sh
@@ -14,7 +14,7 @@ cd thumbnails
 for x in *; do
     large=$x
     small=../thumbnails-small/$x
-    if [ $large -nt $small ]; then
+    if ! [ -f $small ] || [ $large -nt $small ]; then
 	convert $x -resize x"$thumbnail_height" $small
     fi
 done