diff --git a/build-data/BuildArtwork.groovy b/build-data/BuildArtwork.groovy
index b738865d..a778b1a6 100755
--- a/build-data/BuildArtwork.groovy
+++ b/build-data/BuildArtwork.groovy
@@ -41,7 +41,12 @@ void build(ids, section, db, query) {
 		def original = getOriginalPath(section, id)
 		def thumb = getThumbnailPath(section, id)
 
-		if (thumb.exists() || original.length() == 0 && original.exists()) {
+		if (thumb.exists()) {
+			log.finest "[SKIP] $id"
+			return
+		}
+
+		if (original.length() == 0 && original.exists() && System.currentTimeMillis() - original.lastModified() < 90 * 24 * 60 * 60 * 1000) {
 			log.finest "[SKIP] $id"
 			return
 		}