diff --git a/apod.sh b/apod.sh
index ee48c98..59ac848 100755
--- a/apod.sh
+++ b/apod.sh
@@ -1,7 +1,7 @@
 #!/bin/bash
 NASA_APOD_BASE_URL="https://apod.nasa.gov/apod"
 IMAGE_URL=`curl -s $NASA_APOD_BASE_URL/astropix.html | grep -oh 'href="image/.*"' | grep -oh 'image/.*jpg' | head -1`
-if [ ! -z "$IMAGE_URL" ]; then
+if [ -z "$IMAGE_URL" ]; then
   curl -s "$NASA_APOD_BASE_URL/$IMAGE_URL" > image.jpg
   gsettings set org.gnome.desktop.background picture-uri "file:///home/pi2/Pictures/wallpapers/blue_galaxy_wallpaper.png"
 else