diff --git a/quack.sh b/quack.sh
index 084266ae71bcbccc1474e17d658b0ba799ca2bcb..02be3f23e61fb7bf31e9f7a306f977620db4b331 100755
--- a/quack.sh
+++ b/quack.sh
@@ -292,7 +292,7 @@ function makeImages() {
         local CONV="$SRC_IMAGE"
     fi
 
-    if [ ".true" == "$TILE" ]; then
+    if [ ".true" == ".$TILE" ]; then
         if shouldGenerate "$FORCE_TILES" "$TILE_FOLDER" "tiles"; then
         # TODO: Specify JPEG quality
             deepzoom "$CONV" -format $IMAGE_DISP_EXT -path "${DEST_FOLDER}/"